Why bother putting yourself through the troubles of undergoing a typical OneWingedAngel? It's too damn messy, too damn long, too damn late, and it makes you look so damn ugly that it guarantees your death. Hell, your OneWingedAngel might even be [[ClippedWingAngel clipped]] as you're performing it, leaving you as an even better target.

However, you can't undergo a OneWingedAngel that completely [[CurbStompBattle annihilates]] your enemies - [[VictoryIsBoring that's too dull]]. Such an exaggeration of your {{Badass}}itude almost always [[VillainSue tarnishes your reputation]]. So, how can you fight your opponents adequately, enough that you're not as likely to lose, but enough that you're not going to win automatically? Find an EmpathicWeapon (or make one), and merge with it. You get a boost in power, likely enough to hold your own against your enemies, and your margin of error is about equal to that of the heroes' - it can go either way.

SubTrope of OneWingedAngel. Contrast FusionDance. Also contrast NaturalWeapon (the weapon is already part of your normal anatomy) and EquippableAlly (when something or someone else becomes your weapon).
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!!Examples:

* In ''Manga/{{Bleach}}'', the TropeCodifier, this can be found in the Arrancar, an [[BishonenLine evolved race]] of [[TheHeartless Hollows]]. Unlike the Shinigami, an Arrancar's Zanpakuto is their Hollow form sealed within a weapon, and it isn't sentient. Activating their Zanpakuto is called Resurrección, allowing for a near-complete restoration of their former Hollow selves.
** During the Bakkoto arc. One of the assassins, Jinnai Doko, literally eats parts of his scythe/Bakkoto Retsurai and turns into a monster with the skin made of blades.
** Toward the end of the Bount arc, Yoshino Soma fuses with her Doll Goethe, transforming into a humanoid fire elemental made out of flames and magma. Both entities are still present, but Yoshino is the dominant character in the merger, reflected in their hybrid having a distinctly female figure.
** Ichigo merges with Zangetsu and his inner hollow, to perform Mugetsu.
* ''Manga/{{Naruto}}'':
** One very fierce battle had Kisame Hoshigaki fuse with [[EldritchAbomination Samehada]], his EmpathicWeapon.
** In a ''Naruto'' filler arc, the BigBad merges himself with the various weapons of all his now deceased underlings, resulting in a living armor shell with blades and energy dragons coming out of it.
* The Unison Devices in the ''LyricalNanoha'' franchise are tiny sentient humanoids who exist specifically to physically merge with their masters and give them enormous power boosts. The only downside is that very few mages can handle Unison.
* ''QuestForCamelot'': Ruber uses a potion that causes this on his army.
* Wapol from ''Manga/OnePiece'' can merge himself with a weapon after eating said weapon. This can result in him having cannons in lieu of hands and tongue. He also tries to go over the top by devouring the whole armory of his castle, but Nami stole the key from him in time.
** He used this form once against Dalton in a flashback. And Dalton, who's pretty badass for a supporting character, was completely overwhelmed.
** Secondary character Baby 5 ate the Buki Buki Fruit (Weapon Weapon Fruit), which allows her to turn herself into weapons, including a huge sword and a missile.
* Valon in the ''Waking the Dragons'' arc in ''Anime/YuGiOh'' uses Armor monsters, which do act something like this, given that 1) the Orichalcos power makes them real, and 2) he actually ''wears them'', allowing the player to actually take part in the active destruction of other monsters.
** Dartz merges with the Great Leviathan at the end of the season.
* In ''VideoGame/{{Final Fantasy XII}}'', the final battle against [[{{Designated Villain}} Vayne]] [[{{Big Bad}} Solidor]] is broken into three separate battles. In the last battle, he fuses with the rogue Occurian Venat (one of the gods) to form [[{{One Winged Angel}} The Undying]], which serves as the final boss. In this case, Vayne had kind of been Venat's weapon (against the other gods).
* In ''TabletopGame/{{Pathfinder}}'', a high-level summoner has the ability to merge forms with his/her [[{{Summon Magic}} eidolon]], combining their stats and effectively acting and fighting as one being.
** The Synthesist archetype allows them to do it from level 1, at the cost of not being able to summon the eidolon as a separate being.
* At the end of ''VideoGame/{{Atelier Iris 2|The Azoth of Destiny}}'', Palaxius pulls this trope when he merges with the Azoth for the final boss fight.
* This is present in ''VideoGame/TheLegendOfZeldaSkywardSword''; [[spoiler:Demise uses Ghirahim as his weapon in the final battle]].
* In ''Series/PowerRangersOperationOverdrive'', the Sentinel Knight merges with the sword Exelsior, giving him a physical form once more; he's then able to go from humanoid to sword and back at will. After some adjustments by the team's TVGenius, he also merges with Mack the Red Ranger to give him his SuperMode.
* In KingdomHearts, Ansem, the Seeker of Darkness, merges himself with a giant Heartless ship (Which appears to be the OneWingedAngel form of his GuardianEntity, who more or less is his weapon).
* In ''Manga/{{Claymore}}'', [[spoiler:Priscilla absorbed her MadeOfIndestructium ThunderboltIron sword when she first Awakened. She can make parts of her body NighInvulnerable thanks to the sword's metal. When she gets serious, she reverts to her original Claymore self and reforms her sword.]]
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