"A flashy feature that has limited usability for victory."

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* In {{FanFic/TheMasksWeWear}}, both Zuko and Azula learn how to use their firebending to fly by using controlled jets of flame.
* In the {{Fanfic/Uplifted}} series, The Tiger tank prototype, as Hoch and Hanala find out when trying to take one deep behind enemy lines in Libya. It's clunky, over engineered, and unreliable in the conditions they face.
* In ''FanFic/AeonNatumEngel'' and ''FanFic/AeonEntelechyEvangelion'' the Military views the Evangelions as unnecessary large Engel-prototype relics from the past. In the latter this view is somewhat extended to the conventional mecha, at least by the tank crews.
* [=BlackMegaGargomon=] from the ''FanFic/TamersForeverSeries'' has an unbelievably powerful technique known as the '''''Black Moon Flare''''', which causes unfathomable amounts of devastation within a vast radius. Unfortuneatly, the technique happens to be a little ''too'' powerful, and D.C is only ever able to manage one use of it. [[spoiler: And that ends up being a WorfBarrage]]
* In ''FanFic/CalvinAtCamp,'' Calvin, Jason, and Marcus try to attack Kevin with medieval weapons, but find out the hard way that although the weapons look cool, they are impossible to lift.
* In Shadow Snark, the titular characters wings are made of solid iron, which though badass doesn't give him the ability to fly. A very crippling handicap for a pegasus.
* In ''[[http://www.fanfiction.net/s/8233291/1/Princess-of-the-Blacks Princess of the Blacks]]'', Jennifer (A GenderFlip of Harry) uses a form of invisibility that's undetectable to Moody's magic eye. However, since it works by bending light away from a person, they're likewise blind for its duration. The only reason Jennifer uses it is because she's already blind (though on a potion regimen to regain her sight).
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic, ''[[http://www.fimfiction.net/story/101441/the-dusk-guard-rise The Dusk Guard: Rise]]'' resident WrenchWench Sky Bolt has several ideas for things like fast and powerful airships and protective armor, but acknowledges that they are too expensive and material-heavy for mass production and general use. For a six-pony EliteArmy such as the Dusk Guard however, they're absolutely perfect. In fact, it is the ability to pursue these ideas that Steel Song uses to entice Sky Bolt into the unit.
* In Manga/{{Bleach}}[=/=]{{Naruto}} crossover ''[[http://www.fanfiction.net/s/6701262/1/True-Warriors-Never-Die True Warriors Never Die]]'', Naruto is the jinchuuriki of the [[EldritchAbomination Juubi]] which (in addition to having 2000 years to hone his skills) gives him destructive power comparable to [[BadassGrandpa Yamamato]]. The downside is that he has to fight the Juubi roughly every 1000 years to insure it doesn't try to destroy the world again. As he recently found out, the more he uses its power, the faster the Juubi recovers. [[spoiler:In fact, despite using his jinchuuriki mode only a few times, the Juubi is already stirring, 900 years early.]]
* The ''Galaxy Crusher'' in ''FanFic/SonicXDarkChaos'' is a star-sized Demon superweapon capable of erasing an entire ''galaxy'' with a single shot and has the defensive firepower of over half the entire Demon Imperial Navy. However, [[RealityEnsues the sheer collateral damage it causes and its mind-boggling logistic requirements]] (and the threat of it being turned against its creators) led Maledict to deactivate it after it was only used once. The entire Demon military itself can also pretty much described as AwesomeButImpractical, focusing on enormously large and powerful battle machines that are expensive to operate and replace.