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-->''"The 5th cascader is pressed for a resulting multiplier of 5,101,894!!!! The final remaining die now has 9,817,920 * 5,101,894 = 50,090,870,753,280 sides!!!!!!"''
-->-- Webcomic/ProblemSleuth
In a combat game, with everything else considered such as basic attack damage, the attacker's strength, the victim's defense and resistance, and anything else that may modify the damage, a same attack will always do the same damage to the same enemy. Either that, or the game doesn't use a damage formula to begin with.

This, however, is when an attack doesn't always deal the same damage every time - it highly [[GameplayRandomization depends on your luck]].

In some games (notably [=RPGs=]), even normal attacks have a range of values as their base damage. The idea is: No two strikes are ever the same. Maybe you hit a previous injury, or an armored part of the monster, something that's subject to the gameplay's conservation of detail. For games like these, only examples where an attack has a particularly wide range of damage values should be listed here.

Note that this doesn't just apply to attacks - it may be buff spell, defensive technique, even healing - so long as its effects vary depending on random chance.

TheGambler class usually will have many attacks of this property as part of their gimmick.

Related tropes are RandomNumberGod, RandomEffectSpell, CriticalHit and CriticalFailure. Subtrope of UnpredictableResults.

Compare and contrast FixedDamageAttack, PercentDamageAttack and SituationalDamageAttack.

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!!Examples:

[[foldercontrol]]

[[folder: [=4X=]]]
* ''VideoGame/{{Stellaris}}'': ''Arc Emitters''[[labelnote:*]]and its upgrade, ''Focused Arc Emitters''[[/labelnote]] are one of the options for [[WaveMotionGun Spinal Weapon hardpoint.]] Compared to its alternatives, its damage is randomized and a bad roll means a measly 1 damage. On the other hand, it completely ignores Shield, Armor ''and'' Evasion, allowing it to deal full Hull damage at all times and force the enemy to Disengage. Its random damage can also be mitigated by bringing [[BeamSpam a sufficient number of them,]] that it's legitimately a GameBreaker.
[[/folder]]

[[folder: Card Battle Game ]]
* ''VideoGame/{{Hearthstone}}'':
** This was a mechanic for Shamans in the [[EarlyInstallmentWeirdness very early days]]. Crackle is a spell from ''Goblins vs. Gnomes'' that costs 2 Mana with 1 Overload[[note]]You have X less Mana the next turn[[/note]] that deals somewhere between 3 and 6 damage to a single target. At worst, it's a more expensive Darkbomb, and at best it's a cheaper Fireball. There's also Elemental Destruction which deals between 4-5 to all minions and Overloads for 5. Lightning Storm used to deal 2-3, but was later buffed to always deal 3.
** Imp-losion is another randomized spell from ''Goblins vs. Gnomes'' that's even swingier than the Shaman examples. It's a 4-mana Warlock spell that deals 2-4 damage at random and summons a 1/1 Imp for each damage dealt. Hitting the full 4 was a massive tempo swing, however only hitting 2 could be game ''losing''.
*** This mechanic was [[ScrappyMechanic overall disliked]], since it was frustrating for the opponent on a highroll and frustrating for the player on a lowroll. ''Hearthstone'' certainly embraces randomness, but [=GvG=] set an early boundary on what was and wasn't fun RNG.
[[/folder]]

[[folder: Fighting Game ]]

* In ''VideoGame/ArcanaHeart'', a character using Saligrama will get a dice attack where the damage is of course randomized and can sometimes get a buff if you're hit, you hit your opponent or you take fatal damage.
* In the ''VideoGame/SuperSmashBros'' series, Mr Game & Watch's side special attack (called "Judgement") does random damage AND random effects ranging from Mr Game & Watch damaging himself through various StatusEffects to smashing the opponent off the map for a OneHitKill. Which effect you get corresponds to the number above his head.

[[/folder]]

[[folder: First-Person Shooter ]]

* ''Videogame/TeamFortress2'' by default used to have nearly every weapon's damage slightly randomized (10% more or less[[labelnote:Technically]]It's actually the ''distance'' between attacker and target that had a random amount added or subtracted, which in turn affected the damage.[[/labelnote]]), with the exception of [[CriticalHit Critical Hits]]. This was changed in a later update, however.

[[/folder]]

[[folder: Hack and Slash ]]

* [[ShockAndAwe Lightning-based attacks]] in the ''VideoGame/{{Diablo}}'' franchise do damage randomly between 1 and some huge number.
* Similarly, in ''VideoGame/PathOfExile'' lightning spells and attacks have a much bigger damage range than any other type.

[[/folder]]

[[folder: MMORPG ]]

* ''VideoGame/{{Dofus}}'' has a [[TheGambler gambling class]] in Ecaflips who have moves that deal damage randomly between a minimum and maximum base damage amount. The majority of their skills have random base damage, and are themed around gambling themes like card games, slot machines, and coin flipping. Some of their skills even heal the enemy back a small amount to add to the gambling theme.
* In ''VideoGame/{{Elsword}}'', Trapping Ranger's Fatality skill can deal either massive, medium, low or ScratchDamage in one hit.
* ''VideoGame/PhantasyStarOnline2'' has the Meteor Fist Photon Art for the Knuckles weapon. This is a chargeable attack that causes golden fists to [[DeathFromAbove rain down on your foes.]] How the fists manifest vary by chance; you can get one small fist, a rain of small fists, or one gigantic fist that does absurd damage. However, the attack needs to be charged in order to see the giant fist at all.
* Perhaps one of the biggest complaints about ''VideoGame/WorldOfTanks'' is the RNG involving nearly all aspects of a shot. Guns generally display their average damage when viewed in-game. Actual damage can vary by 25% in either direction and a string of low damage rolls can seriously hamper a player, especially at higher tiers as average damage and variance increase.
* ''VideoGame/{{Wynncraft}}'':
** While all weapons deal damage determined by a range of values, the limits are often further apart with [[ElementalPowers Thunder]]-based weapons, reflecting Thunder's portrayal as a more chaotic element.
** {{Exaggerated|Trope}} with [[https://wynncraft.fandom.com/wiki/The_Nothing The Nothing]], a wand that can be purchased as a reward for completing the [[TheVeryDefinitelyFinalDungeon Eldritch Outlook]]. Its damage parameters and [[VideoGameWeaponStats identifications]] are such that it will ''either'' deal several thousands of points of damage in a single hit, or [[CriticalFailure none at all]].

[[/folder]]

[[folder: Real Time Strategy ]]

* ''VideoGame/Dota2'': Every unit from the heroes to creeps has attack damage that has a variable so damage is always dealing between minimal or maximum damage. Chaos Knight not only has the most extreme damage variable (-15/+15 compare to most heroes's -3/+3 at average) but also has Chaos Bolt, which inflicts a random but inversely-related amount of damage and stun. Upgrading the spell increases both the maximum and minimum values of both the damage and stun, but there's still a big difference between a 275 damage skill that stuns for 2 seconds, and one that does 100 and stuns for 4.
* ''VideoGame/DawnOfWar'': Damage values for some units (especially orks) are all over the place, though this is less the damage and more the accuracy being random.
* ''VideoGame/KingdomRush: Vengeance'' has the Orc Shaman tower. At maximum level, the basic damage from their lightning strikes ranges from a measly 35 to a huge 190.
[[/folder]]

[[folder: Roguelike ]]
* ''VideoGame/BountyOfOne'': Normally, all your attacks deal a fixed amount of damage. However, taking the Fickle Bullets item makes all your projectile attacks deal between 80% to 180% of their original damage.
* ''VideoGame/DarkestDungeon'': The Occultist's Wyrd Reconstruction is a healing version of this. It has the potential to be the highest single-target healing skill in the game (more than double the next best single-target heal, the Vestal's Divine Grace), but its minimum heal amount is a big fat 0. On top of that, it has a chance to inflict Bleed to deal DamageOverTime. Best case scenario, it crits and fully heals your tank. At worst, it heals for 0, inflicts Bleed, and causes the target to die from Bleed damage.
* The old DOS game ''Wizard's Castle'' deals consistent damage with physical weapons, but the magic spell Fireball deals between one and fifteen points of damage, fifteen being enough to OneHitKill any adversary. Similarly, the Web spell will render an adversary unable to strike for as few as one turn to many as five turns.

[[/folder]]

[[folder: Role-Playing Game ]]

* In ''VideoGame/BoxxyQuestTheGatheringStorm'', Katy has an attack that deals a random amount of damage to every enemy on the field. At the end of her sidequest, she gives Catie a reusable item that does the same thing.
* ''VideoGame/BraveHeroYuusha'': The Charge attack, which "Deals random damage to one enemy."
* ''VideoGame/ChronoTrigger'': Lucca has the Wondershot gun. It has very high attack power, but its damage is affected by a multiplier that can range from 10% to 300%.
* The ''VideoGame/EpicBattleFantasy'' series has Lucky Star, a recurring NonElemental spell available for Natalie since [[VideoGame/EpicBattleFantasy1 the first game]]. Whilst cheap on MP (in the first four games)/having no cooldown (in ''VideoGame/EpicBattleFantasy5''), its damage varies wildly - it can barely tickle its victim, or inflict devastating damage for its cheap cost. ''VideoGame/EpicBattleFantasy3'' introduces Star Shower, a multi-target version, whilst ''VideoGame/EpicBattleFantasy5'' introduces Falling Star, a weaker variant of Lucky Star which appears exclusively from random effects.
* Weapons in the ''VideoGame/{{Fallout}}'' series generally have a damage range listed in their stats.
* In several ''Franchise/FinalFantasy'' games there's a high-level spell called "Comet" or "Meteor" with a huge variability in its damage output -- it could do 100 points of damage one turn and [[OneHitKill 9999]] the next, when other spells are more consistent from one use to the next.
* In ''VideoGame/FinalFantasyVI'', [[TheGambler Setzer's]] dice weapons do entirely random damage which is only affected by his level. The game rolls either two or three six-sided dice (depending on the weapon), then multiplies their face values together along with Setzer's level to get the final damage. Doubles and triples multiply the damage further. Since the enemy's defense isn't considered, these weapons are best used against enemies with exceptionally high physical defense such as Cactuars.
* Cait Sith's Dice LimitBreak in ''VideoGame/FinalFantasyVII'', which rolls several dice and then inflicts damage equal to the result multiplied by 20 to one enemy.
* In ''Videogame/FinalFantasyIX'', [[LethalJokeCharacter Quina's]] normal attack does random damage which is either pathetic or higher than any other physical attacker. This makes him/her a capable (if unreliable) Fighter-type character, but his/her specialty is Blue Magic anyway.
* In ''VideoGame/FinalFantasyX'', Wakka's Attack Reels overdrive deals as many hits as the number you line up in a quick slot reels MiniGame. This can add up to quite a bit or be barely anything at all depending on the player's reflexes.
* Axes and bombs in ''VideoGame/FinalFantasyXII'' vanilla do random damage unless you score a CriticalHit, that consistently deals devastating damage. That, and the fact that most of the better varieties of each weapon are hard to come by, make them not viable for much beyond experimentation and [[SelfImposedChallenge Self Imposed Challenges]].
* ''VideoGame/LiveALive'' has some variance to attack damage, but a few are fully randomized: most notably, supporting deuteragonist [[BountyHunter Mad Dog]] in the Wild West chapter has "Texas Jitterbug" as his best attack, involving him spinning in place and firing randomly. He might spread damage out evenly between all adjacent targets, focus the bulk of his fire on a random target, miss some targets entirely, or somewhere between those three possibilities. The problem is that you'll be relying on Mad Dog to carry his weight, because the Sundown Kid is a GlassCannon.
* The Chance Hit ability in ''VideoGame/LufiaTheRuinsOfLore'' does [[FixedDamageAttack fixed damage]] between 20 and 200, ignoring defense. [[DiscOneNuke It can be learned when your physical characters are doing about 30 damage with a standard attack]], and won't be topped by your main attackers until late in the game.
* In ''VideoGame/MegaManBattleNetwork'' series, [=NumberMan.EXE=]'s Dice Bomb deals damage based on the number on the top side of the dice.
* ''Franchise/{{Pokemon}}''
** The move Magnitude has a power between 10 (Magnitude 4) and 150 (Magnitude 10).
** The move Psywave also does random damage; specifically it deals a random number between 0.5x and 1.5x the user's level.
** Present does variable damage, in particular with a chance to do negative damage (i.e. heal the opponent).
** Some moves, such as Fury Attack, Pin Missile, Bullet Seed and others, deal normal damage with each hit but hit a random number of times. This is negated if the user has the Skill Link ability, when they'll always hit the maximum amount of times (usually five) unless the opponent faints before all of them hit.
* In ''VideoGame/SuperMarioRPG'', enemy attacks have no random variation of damage, but the player's attacks do. The variation depends on the weapon; unarmed attacks have no randomness, whereas the Masher and Lazy Shell have a very large random factor.
* The Trust mechanic in ''VideoGame/ValkyrieProfile'' works effectively like this. Overall potential damage is calculated by a weapon's power and the strength stat of the user, but then there's a variable that gets multiplied in based on the Trust rating of the weapon (with each trust point equal to 1%). A weapon with 100 trust will always do its maximum potential damage, while a weapon with 25 trust can do anywhere between 25% and 100% of its maximum potential damage. Worth noting is that the InfinityPlusOneSword has a 1 trust - it's quite capable of doing ScratchDamage even at the end of a massive combo with a FinishingMove.
[[/folder]]

[[folder: Tabletop Game ]]

* ''TabletopGame/BattleTech'': Missiles, cluster munitions for [=LB-X=] autocannons, and a few other weapons are considered cluster weapons and have you roll on the cluster table based on the weapon type. For example, an LRM 20 hits with between 6 and 20 missiles on a successful shot, with each missile dealing one point of damage, grouped into clusters of five missiles. Also, plasma weapons deal variable damage to targets that don't track heat: against ground vehicles, [[PowerArmor Battle Armor]], or [[MiniMecha Protomechs]], a plasma cannon deals 3d6 damage where most weapons deal a set amount of damage.
* ''TabletopGame/Warhammer40000'':
** This game has several weapons with random strength or random amount of hits, usually determined by D6 or D3 roll. Examples include Chaos daemon weapons (random amount of hits) and Ork zzapguns (random strength). The most extreme example is probably the Dark Eldar Casket of Flensing, which has random range, random amount of shots ''and'' random strength.
** Weapons with situational damage also exist, but are much rarer. The conversion beamer, a rare weapon available to certain Space Marine characters and Inquisitors, deals more damage the further away the target is, while the pulse submunition cannons of the Tau R'varna battlesuit increase in strength and amount of hits as the target's size increases.

[[/folder]]

[[folder: Turn-Based Strategy ]]

* In ''VideoGame/AdvanceWars'', Flak's CO power randomly makes his units do a lot more more damage or a lot less. His SuspiciouslySimilarSubstitute Jugger has the same ability. Nell and her kid sister Rachel have a variant on this - their CO powers give their units a chance to do quite a bit more damage than usual, but without the "sometimes your hits will suck" part.
* ''VideoGame/{{XCOM}}''
** In the old ''X-COM'' titles, the weapon stats displayed in game show average damage. Guns roll from 0 to 200% of that, while explosives roll 50-150%. Lucky soldiers can survive point-blank heavy weapons fire while unlucky ones die to stray pistol rounds.
** The "Damage Roulette" Second Wave option for ''VideoGame/XCOMEnemyUnknown'' changes all attacks save for explosives, psionics and MEC subsystems ([[FireBreathingWeapon flamethrower]], [[PowerFist Kinetic Strike Module]] and [[ElectromagneticPulse Electro Pulse]]) so they can can deal between [[ScratchDamage 1 damage]] and 150% of the max base damage. A CriticalHit will deal the weapon's base damage ''plus'' what the regular attack would cause, so they're especially powerful. Which means your soldier can be [[ScratchDamage tickled]] by a Sectopod's [[WaveMotionGun chest cannon]], or a late-game armor wearer can be one-shot by a lucky crit from a mid-tier enemy.
[[/folder]]

[[folder: Non-Game Examples]]
* ''Webcomic/ProblemSleuth'': The Catenative Doomsday Dice Cascader is a machine that uses a process of dice-rolling to determine the damage it deals. First, a central die is rolled to decide how many of the six others will be rolled to determine the actual damage. All the selected dice are then rolled, and each result is multiplied by the previous total to determine the sides of the next die (for instance, if the central die rolls a six and the second one a two, all further dice have twelve sides; if the third rolls an eight then all further dice will have ninety-six sides, and so on). This can end with a final die with a monstrous number of sides, which is then rolled to determine how much damage is dealt to the target. The Cascader is used in [[https://www.homestuck.com/extras/20 a non-canon strip against the Midnight Crew]], ending with a final die with over fifty trillion sides. It rolls a one.
[[/folder]]
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