Evolution Curse

Evolution Curse (進化呪い Shinka Noroi) is a Curse that revolves around the evolution of the user's body, allowing them to "evolve", or in other words, "bloom" once they have met the appropriate conditions.

Description
This particular curse is exceedingly rare in terms of usage, compared with other curses. It allows the user to "evolve" once he has met the appropriate conditions, shedding off their previous form for a new one. However, to fuel up the effectiveness, one must connect, bond and understand oneself's mind, heart, and desires. Thus, once the user understands, connects and bonds with his mind, heart and deepest desires, his willpower will fuel up the effectiveness of the activation, effectively manifesting their utmost desires into a new and stronger form. However, this power does have flaws and drawbacks.

If one neglects and ignores his deepest desires, he will risk getting corrupted by the new vessel, as one's willpower is not enough to fully harness the activation, thus allowing the new vessel to manifest on the user's body. Also, it should be noted that there are many cases that if the user is pitted into a fit of blind rage, the new vessel is more prone to manifest on the user's body. Hence, acting by pure instinct will cause the user to be unable to understand his deepest desires, thus disabling the activation and making the user more prone to corruption by the new vessel.

Trivia

 * The Curse is based off the Hogyoku from Bleach.