History Main / InfinityPlusOneSword

** In the first ''Alpha'' game, you have the SRX; while it's given to you in the midgame, by the end you will get the R-GUN and either Villeta or Levi/Mai as a pilot with the proper upgrades. This endgame version of the SRX can one-shot even FinalBoss with no issue.

* Original Generation has the Shishioh blade a powerful equip able katana that has immense damage output and zero EN cost usually behind some hidden requirement such as getting a certain number of battle masteries and and defeating a boss that retreats at a certain damage level.
* In alpha one you have the SRX while given to you midgame by the end you will get the R-GUN and either Villeta or Levi/Mai as a pilot with the proper upgrades this endgame version of the SRX can one-shot the FinalBoss with no issue.

** Ronin: Forbidden Medicine. You can easily save a LeroyJenkins by throwing these at them to heal them and blast away enemies, or throw it at the ground to save yourself from an ambush. And since the reload speed is ridiculously high, you can rapid-fire these without penalty.

** Geno, Mallow, and Bowser's [[InfinityPlusOneSword Infinity Plus One weapons]] are located within three of the six puzzle doors in Bowser's Keep (Bowser's and Geno's are in the Battle doors, while Mallow's is in one of the Action doors). The other Action door contains Toadstool's [[InfinityMinusOneSword Infinity Minus One weapon]] if you haven't gotten the Frying Pan yet.

* ''VideoGame/OctopathTraveler'': The Battle-Tested weapons are the most powerful in their respective categories and can bought/stolen from important [[=NPC=]]s later in the game. The sole exception is the Battle-Tested Axe that's surpased by three other weapons, with the Memorial Axe being the strongest one in the game.
* ''VideoGame/OctopathTravelerII'': The Battle-Tested weapons return and are once again the strongest in their respective categories. The sole exception is now the Battle-Tested Blade which is surpased by the Serpent Slayer.

** ''Fallout 2'' has a Gauss Rifle which fits this trope perfectly. Landing a critical to the eyes WILL kill most enemies, no questions asked. To quote the Fallout wiki: "the [[LudicrousGibs Bloody Mess trait]] is seldom necessary to see the most violent death animations" (which in this case means [[CruelAndUnusualDeath blowing a sizeable hole in the target's torso]]). Another excellent weapon is the [=YK42B=] Pulse Rifle which, while very short-ranged, deals the highest damage of all single-shot weapons in the game, even without criticals. Scoring a lethal critical literally '''vaporizes''' the target!
** ''VideoGame/{{Fallout 3}}'':

* In VideoGame/DungeonFighterOnline, the reinforcement system allows for ''any'' weapon/armor/accesory to be powered in terms of damage, defense, and/or increasing the base stats of your characters up to a (theoretical) value of +32. And reinforcement values from +10 (or +12 for weapons) onward increase those properties exponentially. However, with every new level of reinforcement the success chance decreases by a set percent, and failure at higher levels destroy the weapon/equipment. The only way to counter this is to use tickets to protect the item...at the cost of ''all'' reinforcement levels.

* ''VideoGame/{{Faria}}'': The Muramasa, the most powerful sword, is also by far the most expensive item in the game. The Super Armor can't be purchased; for that, you have to find Zelos and be able to talk to [[LizardFolk his kind]].

** The various Ultima (or Celestial) Weapons in the games. Sometimes requires the completion of a really long side quest, or clearing the BonusDungeon.

*** Each category of weapons (except maybe for the joke ones) has a top-tier one, with the greatest damage output and combo. Namely, there are the [[CoolSword Laser Blade]], [[RoyalRapier Estoc]], [[{{BFS}} Feather Sword]] (for swords), [[PowerfulPick Zaghnol]] and [[SinisterScythe Death's Scythe]] (axes, with the latter being the strongest weapon in the game), [[BladeOnAStick Chauve-Souris]] for spears, and [[PowerFist Force Gloves]] for knuckles.

** In most of the games, each character can unlock a version of one or both swords -- in ''Soul Calibur II'', for example, every character has Soul Edge, but only a few have Soul Calibur[[note]]this can be explained by the fact that Inferno, the FinalBoss of ''II'', is a DittoFighter who fights with a random style and always has that style's Soul Edge as its weapon, and since Inferno is also the will of Soul Edge...[[/note]]. Generally, though, Soul Edge will leech off your lifebar -- would you expect otherwise? -- and those characters who don't have Soul Calibur generally have another really souped-up weapon. Sometimes these weapons not only increase attack strength but ''refill your lifebar at an insane rate'', [[SNKBoss making this the bane of your existence if you encounter the CPU wielding such a weapon in the story mode]].

** In most of the games, each character can unlock a version of one or both swords -- in ''Soul Calibur II'', for example, every character has Soul Edge, but only a few have Soul Calibur. Generally, though, Soul Edge will leech off your lifebar -- would you expect otherwise? -- and those characters who don't have Soul Calibur generally have another really souped-up weapon. Sometimes these weapons not only increase attack strength but ''refill your lifebar at an insane rate'', [[SNKBoss making this the bane of your existence if you encounter the CPU wielding such a weapon in the story mode]].

* ''Literature/MagisterusBadTrip'' has the Over Tricks, or Inheritance as they are collectively known. These are pieces of equipment once owned by the legendary player known as Criminal AO. All of them have been customised to the point that they literally break the laws of physics in the game.

* ''VideoGame/SonicTheHedgehog'':

* ''VideoGame/MadnessProjectNexus2'' has the Prime Blade, whose loadout is obtained as a reward for clearing the Legacy of the S-3LF Eater sidequest. Resembling a clockwork blade with a glitchy-looking blade, it's a powerful sword capable of one-shotting most enemies (even [[EliteMooks Nexus Core mooks]]!) and reducing them to a pile of voxels. To make its infinity-plus-oneness more apparent, it's one of the very few weapons to [[BreakableWeapons lack weapon durability]], meaning you can use it willy-nilly without worrying about it breaking apart on you. The only downside is that it's the only weapon in its loadout, meaning that selecting it will deprive you of other weapons such as grenades until you pick some up, though considering its power output that's a neglible issue at best.

* ''VideoGame/LegendOfGrimrock'' has such weapon for each weapon type. The most straightforward example would be The Dismantler, which has almost entire floor deidcated to it and while not the strongest, it is considered the best weapon overall. [[spiler:And it gives you considerable advantage over FinalBoss]]. Unlike most such weapons it can be obtained shortly after halfway into the game and will help you greatly on lower floors. Other ultimate weapons, such as Zhandul's Orb, Ancient Axe, Crookhorn Longbow and Icefall Hammer, are obtained later from level secrets.

* Some {{Game Mod}}s for ''VideoGame/{{Minecraft}}'' feature items that count as such, more frequently in the form of armor rather than weapons. Of course, since combinations of mods stacked together rarely intertwine, it's possible to obtain one mod's endgame items without going through another mod's progression, turning any such item into a potential GameBreaker unless [[HouseRules a modpack creator counteracts this by gating a powerful item's]] [[ItemCrafting recipe]] [[ObviousRulePatch behind other mods' endgame items]]. One of the oldest examples of an [=Infinity+1 Sword=] in ''Minecraft'' modding is ''[=IndustrialCraft

*** The Master Sword manages to be both an infinity +1 and -1 sword at the same time. When you first get the sword, its attack power only has a meager power of 30 and its energy gets drained if you "break" the sword, rendering it unusable for 10 minutes. The Master Sword is the only weapon that is reusable this way, which puts it miles ahead of other weapons, yet its low attack power won't be suitable for strong enemies. If you're in the presence of an enemy that's under the influence of Ganon, the sword's attack power doubles to 60 and its energy takes a lot longer to be fully depleted. Fully completing the Master Trials in the first DLC pack has the Master Sword powered up to 60 attack power permanently and gives the enhanced durability to boot. While you can easily find stronger weapons, they'll eventually break while the powered up Master Sword will take a long time to be depleted.

*** An odd case with Prishe, during her EX mode she equips Destroyers, which on her original title are inferior to both the weapons used for her unique level 90 (Sphairai) and level 100 (Glanzfaust) weapons on Dissidia. However the Destroyers were the best weapon a Monk could realistically obtain for a long time. (See the Relic and Mythic entries under ''Final Fantasy XI'' below).
* The driving forces behind the events of the ''VideoGame/SoulSeries'' of fighting games are the twin swords Soul Calibur and Soul Edge. The Soul Edge was a legendary sword sought after by countless warriors. Unfortunately, said sword is actually an ArtifactOfDoom, whose hobbies include devouring souls, slaughtering innocents, and becoming its wielder's SuperpoweredEvilSide. The Soul Calibur was a sword created to destroy Soul Edge. The swords are often the ultimate weapons of the characters. Ironically, the motives of many characters revolve around destroying one or both of the swords, rather than claiming them as their own.

*** Inverted with the joke weapons, like Mitsurugi's bokken, Taki's tobacco pipes, Seung Mina's broom, and Link's bug-catching net. They make weird sounds in place of the usual slashing or swooshing sound effects, e.g. the broom reminds the player of [[WesternAnimation/SnowWhiteAndTheSevenDwarfs a certain animated film]], the tobacco pipes sound like hollow tubes being swung around, etc. The game's description of these weapons always includes something to the effect of it lulling an opponent into a false sense of security and self-assuredness, making said opponent easier to take down with these "weapons".

* In ''VideoGame/SuperSmashBrosUltimate'' [[spoiler:you get the Galeem and Dharkon spirits by getting the TrueEnding]]. These have the highest stats out of any spirit and unlike Akuma or Deoxys, they're not [[GlassCannon Glass Cannons]], having [[LightningBruiser equal offense and defense stats]], are neutral type and have effects that allow them to do extra damage against enemies in World of Light (though at the cost of taking extra damage from them) depending on the realm you're in[[note]]Galeem does extra damage to and takes extra damage from Dark Realm foes, while Dharkon does the same to Light Realm ones[[/note]]. They don't come with any support slots, but that isn't really necessary because of how strong they are.

* In ''VideoGame/Borderlands1'' and ''VideoGame/Borderlands2'', any legendary item can qualify. The first game had the Hellfire, a powerful fire SMG that just decimated all in its path. The second game brings it back, and adds the Bee shield. What makes it so unique is that it's an amp shield, a new type that increases the damage of the first shot fired while the shield is charged at the cost of draining the shield. The Bee, however, ''doesn't'' drain when amping a shot, ''and'' has the highest amp damage in the game, making it able to pump out metric craptons of extra damage. It was ''so'' broken, that it has the dubious honor of being the first specific piece of equipment to have its stats alter in a patch.

** ''VideoGame/MegaManX3'' has the Gold Chip, which you get after obtaining all armor pieces, Ride Armors, Sub Tanks, and Heart Tanks but ''don't'' take up any of the special chips, grants you all of the abilities of the four chips you passed up and arms you with a protective barrier when you get hit. But, you can only get it at the first Sigma stage.

** ''VideoGame/MegaManLegends'' has two. One is the Shining Laser, your reward for completing three drawn-out events near the end of the game and spending a metric crap-ton of zenny to fully upgrade. It's basically a big glowing beam that pierces through enemies, has huge range, unlimited ammo, and will kill even the final boss in about three seconds. The other is the Active Buster: homing missiles that fire like a machine gun and, again, have unlimited ammo. You find the parts early on in the game, but it costs even more than the Shining Laser to upgrade, so good luck even doing so at all without playing for hours.

* The Water Sword in ''VideoGame/PrinceOfPersiaWarriorWithin''. To obtain it, the player must complete an optional nine-part "quest" which spans the whole game. On top of that, the plot actually forks, depending on whether the player enters the final boss battle with it or not.

* ''LightNovel/SwordArtOnline'':
** In the LightNovel version, the <<Holy Blade {{Excalibur}}>> is considered the strongest weapon ever in the VR{{MMORPG}} Alfheimr Online. The only way to get it is by moving through all of the impossible dungeons of Jötunheimr, home to the Evil-God Class monsters. One Evil-God Monster requires a party of more than 20 people with the best of equipment ''just'' to stand a chance in fighting them. The first time we see it, however, is when [[spoiler:Kirito uses the MasterConsole to summon Excalibur. In a supreme insult to SmugSnake Sugou, he gives him Excalibur while Kirito sticks with his normal sword. Kirito STILL [[CurbStompBattle brutalizes]] him, ending with cutting Sugou's head off and impaling the thing on his sword... with the Pain Restrictions COMPLETELY OFF. [[AssholeVictim He got off easy.]]]]

*** The game hands you a ridiculously powerful sword, the Royal Sword, for a fairly simple quest early on (A-Rank Hunter). It's one of the strongest weapons in the game, boosts ''several'' stats, and has only one disadvantage -- a slow swing speed. Its only competition is... the Vampire Killer, which starts out ponderously weak but can be boosted with the defeat of a relatively simple BonusBoss. The Vampire Killer is weaker than the Royal Sword, but it's a lot faster and has the quite-useful Holy elemental affinity.

** Mythic weapons require climbing a BonusDungeon to get a weak version of the weapon, killing a bunch of {{Bonus Boss}}es, some of which appear at the end of another BonusDungeon, followed by collecting things that require completing the same content over and over, and this is followed by a series of {{Fetch Quest}}s and BonusBoss battles all leading to get three items that are guaranteed to drop despite what the last version of this entry may have claimed. This is capped by a final PuzzleBoss which, if somehow failed despite the proper strategy being well-documented at this point, will require another set of the three items mentioned earlier. Then they have to be upgraded to Lv99 through the Trials of the Magians—culminating in turning in not one but ''three'' fancy rocks only dropped by the infamous Pandemonium Warden—then reforged to item level 119 and upgraded to Afterglow with a total of 10,300 other more different fancy rocks that drop from high-level battlefields. The cost of buying them from other players can add up almost as dramatically as the time it would take to farm all of them yourself. But, with the notorious exception of the Ninja Mythic, they all augment their corresponding jobs' strengths, making up for their lack of raw power in utility.

** In ''VideoGame/MegaManZero3'', entering cyberspace in the penultimate level forces you into a BonusBoss battle with the first game's Phantom in a SecretTestOfCharacter. The reward for defeating him is the Ultima Boots, which possesses all the abilities of the other Foot Chips.
** ''VideoGame/MegaManZX'' has the Omega Biometal, which you can only acquire by either beating the eight {{Bonus Boss}}es (accessed by [[OldSaveBonus plugging in the third and fourth]] ''Zero'' games into the Game Boy Advance slot) or Omega Zero himself on at least Normal difficulty and then beating the game. Its special ability is an infinite Overdrive to get a [[BattleAura crimson aura]] similar to Omega's. All of the special sword attacks have elemental properties. All normal shots are instant charged blasts, and on top of that, infinite usage of Zero's old Giga Crushes, including the [[Videogame/MegaManX6 Rekkoha]].

** The DS Remake rewards you for defeating the new BonusBoss with an even more ultimate weapon (The Dream Blade/Dreamseeker) for Crono with an even more ridiculously high critical hit ratio (''90''%!!!).

** ''VideoGame/DragonAgeOriginsAwakening'', however, lets you (well, not you, but Wade, but you have to find the materials for him) craft Vigilance. You only have to kill a powerful BonusBoss for one of the key components needed to forge it; the rest of the components aren't terribly difficult to make/buy/find. It gets better; the sword can be customized -- it can be either a longsword or greatsword, made to have better accuracy and cold damage or better power and fire damage, and the blacksmith offers a choice of other extra bonuses too. This is on top of the basic bonuses the sword provides. It even has a unique appearance (which is unfortunately bugged if you installed the Warden's Keep DLC too). The sword is so awesome it even gets mentioned in the ModularEpilogue [[spoiler: and seems well on its way to becoming a Soul Edge expy.]]

** ''VideoGame/EpicBattleFantasy5''[='=]s successor to the Equilibrium (as confirmed by the developer) is the Star Hammer, a cat toy for [=NoLegs=]. It provides a major boost to his stats, it's NonElemental so it works on any enemy baring one of the Glitch types, it casually inflicts Dispel on attacking which is very important as buffs and statuses play a major role in the game, and it provides a 50% resistance to [[FireIceLightning three of the most common elements in the game.]] With Equip Remix, it gains a slightly better offensive boost, the ability to randomly cast one of the strongest summons in the entire game at an extremely low chance. The catch is that getting it requires beating optional harder variations of the first four bosses, and optional harder variation of the Zombie Hydra miniboss, four ''more'' bosses that each inflict a unique permanent status ailment for the fight, and one ''final'' BonusBoss with ludicrous stats, all of whom scale to the player so they cannot be beaten with pure LevelGrinding. Before Version 2 added the Battle Arena, Data Bunker, and Arcade minibosses, there wasn't that much left to use it on outside of the final area.
* ''VideoGame/EtrianOdysseyIVLegendsOfTheTitan'': The weapon fabrication system (you sell the materials to the general store, you can instantly purchase it, plus the same amount of materials per forge slot if you want to make use of the forge options to increase the versatility) makes it ''exceedingly'' difficult to complete one of these -- the ingredients necessary to create the Ultimate Weapons alone are conditional drops from the sixth labyrinth's brutal BonusBoss, and he drops one of it every single time. It takes fourteen days in-game for a boss to respawn, and each ultimate weapon has ''eight'' forge slots, meaning you'd need nine of the boss' items to create a single fully-powered Ultimate Weapon -- of which there are ''several''.

** In ''VideoGame/FinalFantasyXIII'', any weapon can be an InfinityPlusOneSword but you have to level it up and use an item that costs '''2 Million Gil''' or farm a certain BossInMookClothing (there is a trick to make this easier) and pray for a drop. Using these weapons gives the AP + 1 ability in the addition to the weapon's normal effects... this is the only way to get this ability. Even though these are the Ultimate Weapons, more upgrades are available. Leveling the sword to maximum power requires an additional 1.6 Million gil, though this is hardly necessary; a fully-leveled team can quickly defeat the final BonusBoss using fully-powered Tier 2 or basic Tier 3 (Ultimate) weapons.
** In ''VideoGame/FinalFantasyXIII2'', the Odinblade and Odinbolt are the {{Infinity Plus One Sword}}s... but they only hit full power once you've collected all 160 fragments. Each character also has a special weapon that can't even be purchased until after beating the final boss. Even then, the necessary components require prolonged farming of Yomi, a nasty BonusBoss that is as tough as anything else that the player will face in the game.

** Vaan's Anastasia sword in ''VideoGame/FinalFantasyXIIRevenantWings'' starts out as a fairly average weapon (he'll probably have better ones, especially if you've been crafting, and you should). After going through an incredibly grueling BonusDungeon [[spoiler:with freaking ''Yiazmat'' as the BonusBoss]] ''ten times'', the Anastasia becomes the most powerful weapon available to Vaan. How powerful? He'll be able to take down the aforementioned BonusBoss ''by himself''. It doesn't even stop at ten times; in theory, with enough grinding, it's possible for Vaan to become enough of a powerhouse that he'll even one-hit-kill the final boss fight's level 100 Bahamut ([[TacticalRockPaperScissors which his attacks are usually ineffective against]]).

*** The Zwill Crossblades (defeat a BonusBoss during the post-game) are the best daggers (Ignis' primary), with a damage boost if the wielder's HP is full (including having had max HP reduced), ''without'' being reduced to weaker-than-another if it isn't.
*** The Death Penalty (hidden labyrinths again, ''or'' defeat a BonusBoss available during the main game) is the best gun (Prompto's primary), with a 1% chance to inflict [[OneHitKill instant death]] on any enemy that isn't immune to it, which rolls for ''every shot''.

** In ''VideoGame/KingdomHeartsII'', Ultima Weapon can once again be synthesized, this time after acquiring its recipe shortly before acquiring access to TheVeryDefinitelyFinalDungeon. Save the Queen and Save the King can also be synthesized, with their recipes hidden in various worlds during the revisits. Fenrir (defeat [[BonusBoss Sephiroth]]) has a higher Strength stat, and Fatal Crest (clear the Goddess of Fate Cup) has a higher Magic stat, than the Ultima Weapon, while being worse in the opposite stat. Save the Queen and Save the King also have + versions that can be synthesized after making the originals once, with different abilities. Which particular weapon is best depends on the individual player.

** Lufia 2 has the Infinite Plus One Ring in the form of the Egg Ring, which one gets from defeating the [[BonusBoss Egg Dragon]]. But how to fight the Egg Dragon? You have to find all the Dragon bal....err.. eggs scattered throughout the world multiple times. After granting your wish several times, he'll fight you instead, and is one of the most vicious bosses in the game if fought legitimately, or can be [[GoodBadBugs killed in one round]]. The Egg Ring grants whomever equips it with maximum stats and will pretty much guarantee that person will NEVER die and always do max damage.

* ''VideoGame/LufiaCurseOfTheSinistrals'', along with Ancient Cave goodies, has two ultimate swords obtainable by beating {{Bonus Boss}}es that can only be fought in NewGamePlus. Iris' Sword gives a massive boost to magic damage and comes with the three best spells in the game and the Egg Sword bases its attack power off of its wielder's level, becoming more powerful than the Dual Blade by Level 70.

* In ''VideoGame/{{Omori}}'', the ultimate weapons cannot be obtained in the main route, only in the alternative route. In the last day of the route, you can fight BonusBoss Abbi at the end of BonusDungeon The Abyss. After defeating her, she will tell you about the tentacles spread across the game. Interacting with these tentacles afterwards will reward you with the ultimate weapons for each character and four powerful Charms.

** ''VideoGame/Persona4'', unfortunately, is a little more annoying about it. The true best weapons for each character cannot even be found except in a NewGamePlus, and even then can only be collected by beating down a randomly appearing BonusBoss. It's not a terribly ''hard'' bonus boss, if you prepare properly, but each time you beat him, he'll only drop ''one'' item. This means that to get ''everyone's'' weapons, you'll have to beat the exact same boss ''seven times''. Then seven times again if you want to get everyone the best armor in the game.

** Most of party's ultimate armor and accessories can be obtained from either Armscross or from the Ring of Fire battles. Armscross shops can only be accessed after beating a powerful BonusBoss.
** Az'uar's best claws, the Sacred Claws, can be obtained by unlocking Saphira's door in Fyradin. Again, this requires the player to beat the BonusBoss at Armscross.

* Technically not a weapon, but still increases your characters' powers to ridiculous levels, the Sheriff Star is an accessory in most ''VideoGame/WildArms'' games that you obtain after fighting Ragu O Ragula, the most difficult BonusBoss in the largest BonusDungeon in the games.

* ''VideoGame/EndlessSky'': There are only three possible appearances of the [[spoiler:Pug Arfecta]], which has extremely durable shields and hull, the best anti-missile turrets in the game, [[HealingFactor absurd regeneration]], [[spoiler:[[{{Invisibility}} cloaking]],]] and sweltering damage output [[ArmorPiercingAttack that also pierces shields]]. The only way to get one is to capture it, which means you're going to have to [[BonusBoss survive its ridiculous firepower yourself]], ''and'' once you get past all its defences, you'll have to be careful not to just blow it up, which means you need to restrict which types of weapons you can use against it. If you somehow succeed, it can curb-stomp the main story campaign all by itself, but you clearly have a fleet that was already capable of that.

** ''VideoGame/FireEmblemThreeHouses'' has a noteworthy case in that it hands you one [[DiscOneNuke extremely early under the right conditions.]] The Lance of Ruin, a ''22 might E-rank weapon'' is shoved in your hands at the end of ''Chapter 5'' if Sylvain is in the party, and its nuclear might and low rank means it'll be your strongest panic button for a time. This thing will two-shot just about anything for a long time and it'll even kill the [[BonusBoss Death Knight]] if you use [[AntiCavalry Knightkneeler]], as it is on par with the other Relics, which you get much, much later.

* The single-player campaign of ''VideoGame/TelepathTactics'' has four, most of which get [[ICallItVera special names]]. Fangiss Ka, the best mace, is part of Silithis Predat's starting inventory; the [[{{Steampunk}} Steam Crossbow]] is dropped by a late-game boss and can only be used by a promoted crossbowman; and Lyrio, the best bow, is a rare drop potentially found in an optional sidequest. There is also Aravel, an amazing rapier that grants a wide variety of stat boosts; however, it's used by a BonusBoss who doesn't drop her inventory when defeated, so it's not obtainable...[[GoodBadBugs unless you exploit a developer oversight]] and kill her in an earlier fight, in which case she ''will'' drop it.