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SisterTrope to the TimeLimitBoss (when failing to defeat them in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.

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SisterTrope to the TimeLimitBoss (when failing to defeat them in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.
ShootTheMageFirst. VictoryByEndurance is definitely the worst way to fight one.
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* Raging Goliaths are what happens when a Goliath's helmet is shot off of him. These crazed mutant bandits become consumed by anger and start attacking anything and everything unfortunate enough to be near them all the while screaming his head off and [[LaughingMad laughing]]. For every kill they get they gain experience points to level up and when they do they get much bigger and stronger, ultimately transforming into the GOD-Liath. Players, if they're big enough Badasses, can farm them for loot and experience points.

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* ** Raging Goliaths are what happens when a Goliath's helmet is shot off of him. These crazed mutant bandits become consumed by anger and start attacking anything and everything unfortunate enough to be near them all the while screaming his head off and [[LaughingMad laughing]]. For every kill they get they gain experience points to level up and when they do they get much bigger and stronger, ultimately transforming into the GOD-Liath. Players, if they're big enough Badasses, can farm them for loot and experience points.
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* Raging Goliaths are what happens when a Goliath's helmet is shot off of him. These crazed mutant bandits become consumed by anger and start attacking anything and everything unfortunate enough to be near them all the while screaming his head off and [[LaughingMad laughing]]. For every kill they get they gain experience points to level up and when they do they get much bigger and stronger, ultimately transforming into the GOD-Liath. Players, if they're big enough Badasses, can farm them for loot and experience points.
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Alrighty, after checking in Ask The Tropers and leaving this in the discussion for 2+ weeks, I haven't found anything to suggest there's a blanket policy against non-game examples on game tropes. Since nobody's weighed in on the discussion, and I feel that the example (and section) fit the spirit of the trope, I'm readding it.

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[[AC:Non-Video Game Examples]]
* ''WesternAnimation/TheIncredibles'': The Omnidroid is stated by Mirage to be an example of this trope:
-->'''Mirage:''' I've got to warn you. It's a learning robot. Every moment you spend fighting it will only increase its knowledge of how to beat you.
-->'''Mr. Incredible:''' Shut it down, do it quickly, don't destroy it.
-->'''Mirage:''' [[TryNotToDie And don't die.]]
-->'''Mr. Incredible:''' Great. Thanks.
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There hasn't been any comments in the discussion, and there's no policy against RL examples on Video Game Tropes, so if nobody has anything to add, I'll readd the example/section on Friday
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I'm unsure about the example that was deleted, so I've moved it to discussion (alert because discussion pages don't seem to be showing up in watchlists)
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stay on target. be concise


Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of them battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making them easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting them. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.




[[AC:Non-Video Game Examples]]
* ''WesternAnimation/TheIncredibles'': The Omnidroid is stated by Mirage to be an example of this trope:
-->'''Mirage:''' I've got to warn you. It's a learning robot. Every moment you spend fighting it will only increase its knowledge of how to beat you.
-->'''Mr. Incredible:''' Shut it down, do it quickly, don't destroy it.
-->'''Mirage:''' [[TryNotToDie And don't die.]]
-->'''Mr. Incredible:''' Great. Thanks.
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* Buffing itself gradually as time passes, becoming especially dangerous if the player lacks a StatusBuffDispel or if the buff cannot be dispelled.

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* [[StatusBuff Buffing itself itself]] gradually as time passes, becoming especially dangerous if the player lacks a StatusBuffDispel or if the buff cannot be dispelled.
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* Buffing itself gradually as time passes, becoming especially dangerous if the player lacks a StatusBuffDispel or if the buff cannot be dispelled.
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* ''VideoGame/KingdomHeartsII'': Lexeaus' gimmick for his BonusBoss fight in the ''Final Mix'' version is that he has a power level that determines his damage output. He starts off doing so little damage that even if you're Level 1 he's completely non-threatening, but as the fight goes on he will occasionally power himself up and do more and more damage. He'll eventually get strong enough to be able to OneHitKill you even if you're playing on Beginner Mode with maxed out stats.

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* ''VideoGame/KingdomHeartsII'': Lexeaus' Lexaeus' gimmick for his BonusBoss fight in the ''Final Mix'' version is that he has a power level that determines his damage output. He starts off doing so little damage that even if you're Level 1 he's completely non-threatening, but as the fight goes on he will occasionally power himself up and do more and more damage. He'll eventually get strong enough to be able to OneHitKill you even if you're playing on Beginner Mode with maxed out stats.
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* ''VideoGame/KingdomHeartsII'': Lexeaus' gimmick for his BonusBoss fight in the ''Final Mix'' version is that he has a power level that determines his damage output. He starts off doing so little damage that even if you're Level 1 he's completely non-threatening, but as the fight goes on he will occasionally power himself up and do more and more damage. He'll eventually get strong enough to be able to OneHitKill you even if you're playing on Beginner Mode with maxed out stats.
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* The optional boss Mother Brain in ''VideoGame/ChronoTrigger'' can be this. She starts the battle with three Panels that will heal her every turn for a moderate amount of HP. If you kill all three of them, she TurnsRed, getting increased stats and a powerful attack-all spell. Furthermore, her stats will continue to climb at a rapid pace. The longer the battle goes on, the more damage she'll deal and the less she'll receive, and after a few rounds she's practically unkillable. It's generally recommended to avoid this phase entirely by killing only two Panels and leaving the third alive (it will die when she does anyway).
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* ''TabletopGame/BetrayalAtHouseOnTheHill'''s [[spoiler: [[CombatTentacles tentacles]] scenario]] summons several monsters that start out pretty wimpy, but if the players don't manage to win the scenario promptly quickly become extremely dangerous, increasing in strength and speed every few turns.
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* The Tonberry from the ''Franchise/FinalFantasy'' series will usually spend several turns approaching before using its signature "Everybody's Grudge" attack, which deals damage for [[WhatMeasureIsAMook every enemy defeated so far]] to one target.

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* The Tonberry from the ''Franchise/FinalFantasy'' series will usually spend several turns approaching before using its signature "Everybody's Grudge" or "Karma" attack, which deals damage for [[WhatMeasureIsAMook every enemy defeated so far]] to one target.target. This attack can be OneHitKill for characters that have been murdering tons of enemies up to the point they can encounter Tonberries, which usually near the end of the game.
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Well, in that case there\'s no reason not to use she/her pronouns - taken to discussion.
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I changed them because most pages either default to \"him\" or \"they\" and \"they\" generally fits better in most contexts plus I don\'t think the gender needs to be stressed in this context if it\'s for a hypothetical example.


A VideoGame enemy which has to be defeated quickly, lest it become more dangerous. Unlike a TimeLimitBoss, failing to defeat her within a certain amount of time rarely leads to a GameOver (unless the player is careless), but can make things harder for the player in a number of ways:

to:

A VideoGame enemy which has to be defeated quickly, lest it become more dangerous. Unlike a TimeLimitBoss, failing to defeat her them within a certain amount of time rarely leads to a GameOver (unless the player is careless), but can make things harder for the player in a number of ways:



Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of her battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making her easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting her. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

SisterTrope to the TimeLimitBoss (when failing to defeat her in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.

to:

Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of her them battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making her them easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting her.them. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

SisterTrope to the TimeLimitBoss (when failing to defeat her them in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.

Changed: 14

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Pronouns were changed for no given reason. The description refers to the hypothetical enemy as a she to make it clearer when the articles talking about them.


A VideoGame enemy which has to be defeated quickly, lest it become more dangerous. Unlike a TimeLimitBoss, failing to defeat them within a certain amount of time rarely leads to a GameOver (unless the player is careless), but can make things harder for the player in a number of ways:

to:

A VideoGame enemy which has to be defeated quickly, lest it become more dangerous. Unlike a TimeLimitBoss, failing to defeat them her within a certain amount of time rarely leads to a GameOver (unless the player is careless), but can make things harder for the player in a number of ways:



Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of their battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making them easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting them. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

SisterTrope to the TimeLimitBoss (when failing to defeat them in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.

to:

Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of their her battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making them her easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting them.her. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

SisterTrope to the TimeLimitBoss (when failing to defeat them her in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.
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A VideoGame enemy which has to be defeated quickly, lest it become more dangerous. Unlike a TimeLimitBoss, failing to defeat her within a certain amount of time rarely leads to a GameOver (unless the player is careless), but can make things harder for the player in a number of ways:

to:

A VideoGame enemy which has to be defeated quickly, lest it become more dangerous. Unlike a TimeLimitBoss, failing to defeat her them within a certain amount of time rarely leads to a GameOver (unless the player is careless), but can make things harder for the player in a number of ways:



Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of her battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making her easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting her. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

SisterTrope to the TimeLimitBoss (when failing to defeat her in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.

to:

Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of her their battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making her them easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting her.them. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

SisterTrope to the TimeLimitBoss (when failing to defeat her them in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.

Changed: 24

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A Waking Giant can be a DemonicSpider. This is usually balanced out by making her easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting her. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

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A Waking Giant An Increasingly Lethal Enemy can be a DemonicSpider. This is usually balanced out by making her easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting her. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.
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* The Monster in ''VideoGame/{{Evolve}}''. It's initially weaker than the Hunters, but if it gets to eat enough and [[TitleDrop evolve]] once, it becomes larger, stronger and able to fight on even terms with them. If it evolves ''again'', it becomes stronger than the Hunter Team.
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[[AC: SurvivalHorror]]
* In the remake of ''VideoGame/ResidentEvil'', dead zombies who are not [[RemovingTheHeadOrDestroyingTheBrain decapitated]] or [[KillItWithFire burned]] will later come back to life as deadly [[DemonicSpiders Crimson Heads]].
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** Pokémon with the Speed Boost Ability. This Ability causes the Pokémon to gain one stage of a Speed buff at the end of every turn, which means it only takes about a turn or two to outspeed almost any Pokémon in the game.

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** Pokémon with the Speed Boost Ability. ability are banned from competitive play for good reason. This Ability ability causes the Pokémon to gain one stage of a Speed buff at the end of every turn, which means it only takes about a turn or two to outspeed almost any Pokémon in the game.
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** Pokémon with the Speed Boost Ability. This Ability causes the Pokémon to gain one stage of a Speed buff at the end of every turn, which means it only takes about a turn or two to outspeed almost any Pokémon in the game.
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** Pokémon with the Moxie Ability. This Ability causes the Pokémon that has it to gain one stage of an Attack buff (about a 50% boost per stage) every time it knocks out another Pokémon. If not stopped, these Pokémon ''will'' steamroll their way through the opposing team, especially if they can naturally increase their Speed.
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* ''TabletopGame/DungeonsAndDragons'' 1st Edition supplement ''Deities & Demigods Cyclopedia'', GreekMythology chapter. The giant Antaeus grows stronger each round he fights as long as he's touching the ground. He starts with the strength of a hill giant (19) and gains the strength of the next larger giant size each round of combat until he reaches the strength of a titan (25). This allows him to do increasingly more HitPoints of damage when he hits. In addition, each time he grows he regenerates all lost HitPoints of damage and gains an additional 25 HitPoints, making him tougher to kill. So when he starts to fight he has 100 HitPoints and a Strength of 19, doing 2-16 HitPoints of damage per hit. After 7 rounds of combat he has 250 HitPoints and a Strength of 25, doing 8-48 HitPoints per hit.

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* ''TabletopGame/DungeonsAndDragons'' 1st Edition supplement ''Deities & Demigods Cyclopedia'', GreekMythology Myth/GreekMythology chapter. The giant Antaeus grows stronger each round he fights as long as he's touching the ground. He starts with the strength of a hill giant (19) and gains the strength of the next larger giant size each round of combat until he reaches the strength of a titan (25). This allows him to do increasingly more HitPoints of damage when he hits. In addition, each time he grows he regenerates all lost HitPoints of damage and gains an additional 25 HitPoints, making him tougher to kill. So when he starts to fight he has 100 HitPoints and a Strength of 19, doing 2-16 HitPoints of damage per hit. After 7 rounds of combat he has 250 HitPoints and a Strength of 25, doing 8-48 HitPoints per hit.
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* TheIncredibles: The Omnidroid is stated by Mirage to be an example of this trope:

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* TheIncredibles: ''WesternAnimation/TheIncredibles'': The Omnidroid is stated by Mirage to be an example of this trope:
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[[AC:Non-Video Game Examples]]
* TheIncredibles: The Omnidroid is stated by Mirage to be an example of this trope:
-->'''Mirage:''' I've got to warn you. It's a learning robot. Every moment you spend fighting it will only increase its knowledge of how to beat you.
-->'''Mr. Incredible:''' Shut it down, do it quickly, don't destroy it.
-->'''Mirage:''' [[TryNotToDie And don't die.]]
-->'''Mr. Incredible:''' Great. Thanks.
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* In ''TabletopGame/MagicTheGathering'', Primordial Hydra has power and toughness that double every turn, and after it has been on the field long enough to get 10 power, it has trample, making it impossible to chump block.
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[[AC: Action Adventure]]
* The FinalBoss of ''VideoGame/IttleDew'' has a phase where he summons [[DemonicSpider Petal Slugs]] over time. If left unchecked and this phase isn't defeated quickly, they can turn the boss arena into a BulletHell.

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A VideoGame enemy which has to be defeated quickly, lest it become more dangerous. Unlike a TimeLimitBoss, failing to defeat her within a certain amount of time rarely leads to a GameOver (unless the player is careless), but can make things harder for the player in a number of ways:

* [[EnemySummoner Calling]] or [[MookMaker creating]] more enemies after a certain amount of time or {{Reviving Enem|y}}ies who get back up if you haven't defeated their fellows quickly enough after them.
* Powering up into a [[DemonicSpiders stronger form]] if the battle drags on (this might lead to DoWellButNotPerfect if the stronger form has a RareDrop or other reason to challenge it).
* Using a highly damaging attack which takes a few turns of prep (this type of enemy often runs away after doing so). Magic using enemies who need to build up enough ManaPoints (by [[RegeneratingMana recovering them]], or absorbing them from the player with an attack) before they can cast their spells are a specific variant. An ActionBomb is frequently an example.

These changes can either keep building up or they could happen all at once after a set amount of time/turns (or something in between, with the enemy getting stronger at regular intervals). This makes for a slight difference in strategy, as while the former is best defeated as quickly as possible, it might be wiser to defeat the latter as efficiently as possible within the time limit.

Note that this is not just about any enemy with a SuperMode or OneWingedAngel type transformation if they are capable of activating it based on criteria other than time or turn count, and more importantly, does ''not'' apply if they can switch between their regular form and their SuperMode. This trope is for when an enemy waits a certain amount of time, and then, if not defeated within that time, becomes a greater threat for the duration of her battle. Nor is it TurnsRed, which applies only when the enemy's increase in difficulty comes inevitably when it takes enough damage (although it can overlap if the player has a chance to defeat it as it turns). Anything which is a guaranteed TotalPartyKill belongs under TimeLimitBoss.

A Waking Giant can be a DemonicSpider. This is usually balanced out by making her easy to defeat quickly, or with careful planning. But woe betide you if this enemy attacks alongside a StoneWall, GoddamnBats or another enemy which can distract you from fighting her. Compare SequentialBoss, whose "stages" tend to ramp up the difficulty, but you still have to beat every stage to defeat them.

SisterTrope to the TimeLimitBoss (when failing to defeat her in time is an instant game over), BossArenaUrgency (when the area the battle's taking place in is getting more dangerous) and MetalSlime (which costs the player a reward if it isn't defeated quickly instead). Contrast TurnsRed. Compare StalkedByTheBell and TimedMission, which share a similar relationship to this and Time Limit Boss. If you need to clear away your enemies' support to make things easier, then ShootTheMedicFirst and ShootTheMageFirst.

----
!!Examples:

[[AC: First Person Shooter]]
* In ''VideoGame/{{Borderlands 2}}'''s there are a few enemies which can grow into more powerful forms if they're left unchecked:
** Varkids turn into cocoons, which spit out progressively more and more powerful forms. Unlucky (or lucky, if they're farming it) players might end up fighting Vermivorous the Invincible.
** The "Tiny Tina's Assault on Dragon's Keep" DLC has Orks, which grow even more quickly (and instantly), meaning the player is likely to end up fighting (or running from) a [[PunnyName Grand Duke of Ork]].
* The Pain Elementals from id Software's ''VideoGame/{{Doom}}'' series are {{Mook Maker}}s which spit out endless amounts of [[GoddamnBats Lost Souls]], potentially creating a swarm of them if left unchecked.
* The FinalBoss in ''VideoGame/DukeNukem3D'' is the alien queen, who gives birth to a dangerous drone every thirty seconds. Extra difficulty comes from the battle being underwater: once the player's air tank runs out, he's compelled to surface for air periodically, during which one or two new drones will be spawned.

[[AC: MMORPG]]
* Certain bosses in ''VideoGame/WorldOfWarcraft'' have an "enrage" mechanic, which means they become much more dangerous if the battle drags on. For example, Beth'tilac has an area of effect spell that gradually increases in damage every time it's cast.
* Two of the bosses in ''VideoGame/ToontownOnline'', and, by extension, the fan servers, have so-called desperation modes, which crank up the difficulty as the battle drags on:
** The VP's stun time drastically shortens, making him much harder to knock back.
** The infamous C.E.O. After 20 minutes in the final round, one of the conveyors delivering healing snacks to the players will be disabled, and his attacks will become stronger. After 30 minutes, both conveyors will be disabled, his attacks will become even more powerful, he will attack more often, AND he gains a movement speed bonus.
* ''VideoGame/{{Elsword}}'': The BonusBoss Alterasia Type-H is infamous for this. He's surround by constantly spawning Alterasia Spores which periodically heal him. Failing to stay on top of them can cause him to be healed constantly.

[[AC: Platformer]]
* Infinity Mijinion from ''VideoGame/MegaManX6'' will periodically duplicate himself during battle (or when he's struck by a powerful attack). He can potentially fill an entire screen with his copies if you take too much time, making him harder to kill.

[[AC: RPG]]
* The Tonberry from the ''Franchise/FinalFantasy'' series will usually spend several turns approaching before using its signature "Everybody's Grudge" attack, which deals damage for [[WhatMeasureIsAMook every enemy defeated so far]] to one target.
%%* {{Downplayed}} by the various Behemoths in ''VideoGame/FinalFantasyXIII'' transform into a much tougher two-legged form when they drop to half their health. This is just TurnsRed on its own, but the best tactic against them is to max out their BreakMeter quickly, StunLock them in the air so they cannot transform, then kill them before they unfreeze and change form.
* In ''Franchise/{{Pokemon}}'':
** Regigigas has the "Slow Start" ability, which means that it spends the first five turns of a battle with reduced speed and attack. After this, the effect wears off and its real stats come into play.
** Certain moves become more powerful if they gain momentum. Rollout, Ice Ball, Fury Cutter, and Rage will all become more dangerous if the foe can't be stopped, and they're allowed to use it multiple times in a row. Bugsy and Whitney both rely on this strategy in Gen II with a Fury Cutter Scyther and a Rollout Miltank respectively.
* Bosses in ''VideoGame/DiabloIII'' generally [[TurnsRed adopt tougher tactics at certain health thresholds]], or make the arena slowly more hazardous. However Belial has one attack that peppers the arena with randomly-placed explosions, of which there are more each time he does it until they become unavoidable.
* ''Every enemy'' in ''VideoGame/BreathOfDeathVII'' and ''VideoGame/CthulhuSavesTheWorld'' gets stronger the longer the fight drags on, pretty much ruling out any turtling strategy.
* The BonusBoss in ''VideoGame/LufiaIIRiseOfTheSinistrals'' is completely harmless for three turns, saying supportive things and even healing the party. On the fourth turn, he casts a spell that inescapably causes a TotalPartyKill, though thankfully it doesn't cause a game over, merely sends everyone back to the beginning of the 99-level BonusDungeon without their final reward.

[[AC: RTS]]
* High-level paladins in ''VideoGame/WarcraftIII'' have a shield that makes them invulnerable and a mass ressurection ability. If not neutralized quickly, they spend the fight unable to take damage and bring back half a dozen dead units at full health.
** The Firelord's Incinerate ability deals ever-increasing damage with every attack.

[[AC:TabletopGames]]
* ''TabletopGame/DungeonsAndDragons'' 1st Edition supplement ''Deities & Demigods Cyclopedia'', GreekMythology chapter. The giant Antaeus grows stronger each round he fights as long as he's touching the ground. He starts with the strength of a hill giant (19) and gains the strength of the next larger giant size each round of combat until he reaches the strength of a titan (25). This allows him to do increasingly more HitPoints of damage when he hits. In addition, each time he grows he regenerates all lost HitPoints of damage and gains an additional 25 HitPoints, making him tougher to kill. So when he starts to fight he has 100 HitPoints and a Strength of 19, doing 2-16 HitPoints of damage per hit. After 7 rounds of combat he has 250 HitPoints and a Strength of 25, doing 8-48 HitPoints per hit.
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