For Humor's sake, Astarica..

FFXI had "2 Hour Abilities", or "SP Abilities".

Paladin, the mighty turtle tank, had Invincible, which made them immune to all physical damage for 30 seconds.
White Mage, the first and strongest healer, had Benediction, which restored the entire party's hp.
Monk, a boxer of sorts, had Hundred Fists, where it would land blow after blow, non-stop, for the duration.
etc...

And then there was Ninja. Ninja had Mijin Gakure. The only purpose of this ability, for years, was to suicide, to "death warp" to your home point. It had no other real practical use. In the last few years, they changed it so that ninja's weren't weakened when raised after a mijin gakure, but it still is and was pretty awful unless you had Auto-Reraise.

(It did deal damage to the target, but it was worthless amount of damage.)