Many games (especially {{RPG}}s) feature complex systems for determining how much damage is meted out in combat; the attacker's strength and/or skill, the defender's armor, ElementalRockPaperScissors... even the LuckStat may play a part to determine what happens when a character is hit.

But a FixedDamageAttack ignores all this, and instead causes a fixed, predictable amount of damage each time it is used, regardless of all the normal rules.

The amount of damage is often a ''very'' specific, exact number -- for example, an EldritchAbomination might prefer a spell causing exactly [[NumberOfTheBeast 666]] points of damage to whomever it is used against. (This is obviously a dire threat to a SquishyWizard with a maximum of only 700 HP, whereas a MightyGlacier with a maximum of 3,000 HP would no doubt brush it off as OnlyAFleshWound.)

Unfortunately, if the player can acquire one of these skills themselves, it will usually become a UselessUsefulSpell because many RPG systems give [[HealthDamageAsymmetry monsters more HP than the players]], and the fixed amount of damage ceases to remain useful as the player progresses to stronger monsters -- though if acquired ''very'' early on, it could also double as a DiscOneNuke. (It could also provide a OneHitKill against the MetalSlime's low HP and impenetrable defense).

As a means of averting this, some systems may link the amount of damage to the user's experience level in some way, allowing the attack to grow stronger as they do. However, it is still exempt from the normal damage mechanics (including StandardStatusEffects that affect attack or defense powers), and still inflicts a set, predictable amount of damage every time it is used.

Compare and contrast PercentDamageAttack, which is also exempt from normal damage rules. Contrast RandomizedDamageAttack, the total inverse of this, where you can't control how much damage a particular attack deals (or have '''''very little''''' control; it also tends to be exempt from normal damage rules), as well as SituationalDamageAttack, when you can make an attack stronger by manipulating a certain variable.

See also ScratchDamage and {{Cap}}, when a fixed amount of damage occurs for different reasons.
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!Examples:

* in ''VideoGame/CastlevaniaCircleOfTheMoon'', the Diana card gives your whip projectiles, but the strength of their attack is unaffected by leveling up. This makes them one hit kills for early enemies and the first boss, but by the end of the game, your normal whip attack will inflict more damage than most of them, although they are still very useful.
* In many [=RPGs=], characters suffering from the [[StandardStatusEffects "Poison" status]] will often receive a fixed amount of damage at regular intervals; this may be a specific number, or a fixed percentage of their maximum HP. In either case, damage from Poison is exempt from the rules governing attacks and defense.
** ''VideoGame/FinalFantasyX'' probably had the strongest Poison, removing ''25 percent'' of a character's maximum HP per turn, guaranteed to kill him in four turns unless healed.
* The ''Franchise/FinalFantasy'' series is replete with examples, not the least of which is "One Thousand Needles", a FlechetteStorm that inflicts exactly 1,000 points of damage every time it is used; it is the signature move of the "Cactrot" (anthropomorphic cacti) species. Often, the player can acquire this as a [[MegaManning Blue Magic skill]].\\
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Stronger versions exist, such as "10,000 Needles" and "[[UpToEleven 100,000 Needles]]", able to [[OneHitKO inflict more damage than the player's maximum HP cap]].\\
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In ''VideoGame/FinalFantasyVI'', "10,000 Needles" is executed as "1000 Needles" 10 times in a row, each usage targeting a random standing party member.
* Cactrot Rapido in ''VideoGame/FinalFantasyXI'' also has the above version of 10000 Needles. 1000 damage per hit is still a heavy amount, but players can band together in large groups (up to ''eighteen players'', in fact; and that's not counting whatever pets, [=NPCs=], or summons that each player can bring alongside them to soak up damage while the humans keep their distance).
** ''VideoGame/FinalFantasyIX'' has several of these attacks usable by the player:
*** Freya's Dragon Crest, which does damage dependent on the number of dragons the player has killed throughout the game;
*** Zidane's Thievery, doing damage based on the number of successful steals, and his Lucky Seven, which does either 7, 77, 777, or 7777 damage if Zidane's HP currently ends in 7;
*** Quina's Frog Drop, which does damage according to how many frogs you've caught, and his/her Limit Glove, which does 9999 damage if s/he has exactly 1 HP remaining.
** ''VideoGame/FinalFantasyVI'' also features the "Step Mine" / "Traveller" Blue Magic for Strago, which inflicts one point of damage for every 32 steps the player has walked ''from the beginning of the game.'' (To balance this, its cost is proportional to the player's gameplay hours.)
** In ''VideoGame/FinalFantasyVIII'', the BonusBoss Omega Weapon has two attacks that do a set amount of damage. One deals 9998 damage to your entire party, bringing everyone down to 1 HP if they have 9999 health, and KO'ing them otherwise. Another [[OneHitKO always deals 9999 damage]], but fortunately only hits a single target.
** The Jumbo Cactuar adds insult to injury when performing 10,000 Needles, leaning over the victim before clogging that part of the screen with a thousand "10"s.
** Similar to the Thievery example above, ''VideoGame/FinalFantasyVII'' had a rare status effect (for lack of a better term) called "All Lucky 7s" where any character with exactly 7777 HP would fly into an UnstoppableRage and unleash a series of attacks that always cause 7777 damage ''per hit''. However, it reduces the player's HP to one after battle. (But if the player is lucky enough to build one character with a ''maximum'' of 7777 HP....)
*** BonusBoss Emerald Weapon had a special attack that hit each party member for 1111 HP for each Materia that character had equipped. With a normal setup, this would be devastating. However, by equipping sufficiently-levelled characters with two HP Plus Materia, they could reach the cap of 9999 HP. And then get hit for exactly 2222 HP. Which leaves them on 7777 HP. Bingo.
** In ''VideoGame/FinalFantasyX'', two of Rikku's [[LimitBreak Mixes]] give this to your party; the Quartet of 9 makes one ally always hit for a minimum of 9999 damage or healing, and the Trio of 9999 does this to everyone currently battling. It won't reduce your power, so if you have a Break Damage Limit weapon equipped, its wielder will continue to hit above 9999. The best uses of this are with Yuna's Pray to fully heal everyone and any attack that hits multiple times, particularly ones like Rikku's elemental gems that are normally pretty weak.
** In ''VideoGame/FinalFantasyX2'', the "Cat Nip" accessory caused the user's attacks to inflict a fixed 9999 points damage any time time their HP dropped below half. (It could also combine with the Gunner's multi-hit "Trigger Happy" skill, with almost GameBreaker results.)
** The Gil Toss move used by Jugglers in ''FinalFantasyTacticsAdvance''. You use 30 gil to attack, and as long as it hits, it'll always to 30 damage, no matter the enemy.
** The [[BossInMookClothing Tonberry]]'s Karma/Grudge move does damage proportional to number of enemies that the target killed (or the number of Tonberries the party killed). The damage tends to scale up to OHKO levels quickly.
* ''VideoGame/FinalFantasyXII'' lets ''you'' use 1000 Needles. It also has the [[SummonMagic Esper]] [[BonusBoss Zod]][[CastingAShadow iark]], whose [[LimitBreak ultimate attack]] does exactly 50,000 damage and is (oddly) NonElemental.
** The gun weapons from the same game deal damage directly dependent on a character's strength stat and nothing else (not even the separate Attack stat): it therefore damages all enemies exactly the same until you next level up.
** ''VideoGame/BravelyDefault'' has attack items that do exactly this. Their base damage is 500 full-party damage for the weaker variants, 1500 for the stronger, and 5000 single-target damage for one particular item, but certain things can be equipped that will boost them and elemental weaknesses still apply, so one can potentially get them up to 1125, 3375, or [[{{Cap}} 9999]] damage (possibly more with additional element-boosting skills).
* ''VideoGame/ChronoTrigger'' has an enemy that does either an attack that does exactly 1 hp of damage, or an attack that sets HPToOne. Especially fun when you face a group of those enemies, each of them either battering you to near-death or flicking you hoping to snatch that last HP.
** The DS remake adds a bow for Marle that always does 777 damage.
* The VideoGame/{{MOTHER}} series features PsychicPowers (which are the series's magic). These powers are a cross between this trope and RandomNumberGod: they do a fixed amount of damage between a range of numbers, regardless of stats.
** There's also the Bottle rockets from VideoGame/{{EarthBound}}, which do about 120 HP of damage.
* ''Franchise/{{Pokemon}}'' has a variety of moves that inflict a fixed amount of damage regardless of attack/defense powers or ElementalRockPaperScissors.
** "Sonicboom" inflicts a fixed 20 points of damage (on anything but Ghosts, who are immune to Normal-type attacks), while "Dragon Rage" inflicts a fixed 40 points of damage on anything but Fairies.
*** Many a Nuzlocke run has been ruined by the Axew in an early cave in X and Y that comes equipped with Dragon Rage. Many mons the player will have at this point will be unable to take more than one hit from Dragon Rage (if any).
** "Night Shade" and "Seismic Toss" inflict a fixed amount of damage equal to the user's Level, although Normal types are immune to Night Shade and Ghosts are immune to Seismic Toss.
** "Psywave" is a strange one: It inflicts a ''randomly selected'' amount of damage ranging from 50% to 150% of the user's level, regardless of all other factors, against anything but Dark types who are immune to its element.
** "Super Fang" is a PercentDamageAttack.
** "Pain Split" divides the user's and opponent's HP equally between them, thus functioning as a LifeDrain for whichever Pokemon has the lower HP (hopefully the user).
** "Endeavor" reduces the opponent's HP to the same amount as the user (and has no effect if the user has more HP).
** The Fifth generation adds "Final Gambit", which causes the user to faint but inflicts damage equal to however much HP the user had remaining before using it.
* ''{{Persona 3}}'' has a [[CombinationAttack Fusion Spell]], available if the Protagonist has both Helel and Satan in his Persona roster, called "Armageddon" that does exactly 9999 HP worth of damage. It's one of the few ways, if not the ''only'' way, that one can even beat the BonusBoss, as said boss is fond of spamming full-heal spells and character annihilation spells when the character's HP reaches 10,000 or less.
** There's also BonusBoss Elizabeth's [[OneHitKill 9999-damage Megidolaon]], done whenever the player breaks the rules of the fight (it's also done twice, in case, by some miracle, the player manages to survive the first one.)
* ''ShinMegamiTenseiIV'' has [[ArchangelMichael Michael of the Four Archangels]] as a [[DownLoadableContent DLC demon]] and he has one of the nastiest skills in the game, Fallen Grace. This move '''deals exactly 666 points of almighty damage to all enemies!'''
* The Light Brand, an enchanted sword found in several ''FireEmblem'' games, has a ranged attack that always does ten damage regardless of either the attacker or defender's stats. Unfortunately this means that the sword is much more useful to your enemy than it is to you, as any of your units with a high enough weapon level to use it is probably going to deal more than ten damage with an ordinary weapon. It doesn't help that this is one of the few ranged swords that can be obtained.
** In some games, it's affected by stats just like any other magical attack.
** The long-range dark magic attack, Eclipse, has a fixed damage rate. In the sixth game, it automatically took a unit down to 1 HP when it hit. Later games toned it down so that it dealt damage equal to half the unit's current HP (rounded up if it was an odd number).
* In ''VideoGame/RuneScape'', Nomad posesses one attack that inflicts damage equal to your maximum HP - 1. So if you're at full health, you survive with just one HP; anything less and it's an instant kill.
* ''VideoGame/SuperMarioRPG'' contains an attack called "Geno Whirl" which, if properly executed, will always cause 9999 damage to all non-boss ([[spoiler:plus Exor]]) enemies in the game. Oddly enough, the highest HP user in the game only has 8000 HP, making this attack [[ThereIsNoKillLikeOverkill almost humorously over the top]].
* ''VideoGame/{{Xenosaga}}'' uses this in Episode III, against [[spoiler:Citrine, Jr's "sister"]], a boss you fight on the Durandal. One attack dropped all targets' HP to exactly 666. The next attack does - you guessed it - 666 damage exactly. If the enemy boosted after the first attack, well, kiss your ass goodbye.
* In ''VideoGame/LufiaTheLegendReturns'', there are several of these attacks:
** Amon uses an attack that deals 666 damage. It's highly unlikely that you'll have that much HP at this point of the game.
** Several opponents use attacks that will leave you at one HP. One of these will also poison you. And no, you don't have enough equipment at that point of the game to protect everyone against poison.
** Your characters can learn several attacks that remove a percentage of the opponent current HP. One of these halve the opponent HP. And those attacks works on any boss as well.
* ''Jade Cocoon 2'': A particular tree of Earth attacks, while intended to break a specific Earth shield spell, will do a set amount of damage to unshielded targets. The higher the rank of the attack, the greater its damage. This is useful against Divine Beasts with very high Defence stats, since it guarantees consistent damage output, but is much less so in situations where any other attacks, which have the potential for [[CriticalHit critical hits]] or would do more damage anyway, are more effective.
* ''VideoGame/LastScenario'' has a mushroom PaletteSwap with a "One Thousand Spores" attack, a clear ''Franchise/FinalFantasy'' series ShoutOut.
** There's also the Slap spellcard attack, which hits for 1 damage. Useless in combat, but great for snapping allies out of Sleep or Berserk without doing too much damage to them.
* In its SpiritualSequel ''VideoGame/ExitFate'', a certain boss has the spell "Annihilation Ray", which always deals 5000 damage (which is more than your characters are expected to have at any point of the game), regardless of defense or buffs, and can be avoided only by the StatusBuff 'Blink'.
* The first ''{{Breath of Fire}}'' game has the E. Key which is gained early in the game. It does 30 damage to all enemies. Very useful when you first get it because it does more damage than the WhiteMagicianGirl does.
** All spells and the dragon transformations attacks do fixed damage although the damage can be modified by elemental weaknesses and critical hits.
* The sequel has the spell Chop Chop which always does 25 damage. It's gained much later but since it ignore enemy defense enemies that normally only receive 1 or 2 damage from any other attack are all instantly killed by it since the ones with the highest health only have 20 health.
* In ''VideoGame/TalesOfVesperia'', Patty's Card The Gamble and Janpai spells do a varying amount of fixed damage based on what cards or mahjong tiles come up, the most painful being the combinations with the highest point value.
* VideoGame/WildArms3 has this in form of Dark Luceid, a spell that does a fixed amount of damage for every elemental resistance the enemy has. Usually deals pitiful damage given that enemies rarely have more than one elemental resistance (there are eight in total), but then, some Bosses just pile on Resistances...
* ''VideoGame/XCOMEnemyUnknown'' gives the psychic soldiers under your command the starting ability "Mindfray", which deals a meager 5 points damage--but it ''always'' deals them (unless the enemy is immune or practically immune to psychic powers), which in a game where the RandomNumberGod hates your guts is a godsend when you absolutely must finish off an enemy before the end of your turn.
* In WorldOfTanks, a tank that is set on fire starts rapidly losing a fixed amount of health based on its maximum health. Fire damage is the same no matter how the fire was started, but the damage slowly lessens as the fire is put out, and quickly using a consumable fire extinguisher stops any further damage.
* The ''[[VideoGame/HarryPotter Harry Potter and the Chamber of Secrets]]'' Game Boy Color game gives us Aragog (or rather his fangs as Aragog himself is part of the background) who has an attack that deals exactly 80 damage regardless of your defense.
* ''VideoGame/MetalGearAcid'''s Cyborg Ninja [[SummonMagic card]] deals exactly 50 damage to any target. This is [[DiscOneNuke instant death to any enemy in the early game]], but still very handy for taking out cameras later on.
* ''VideoGame/MegaManXCommandMission'' has the BonusBoss, Ninetails, who has a move called Nine Fragments which does 999 damages per hit nine times, adding up to 8991 damage.
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