Rage of a Hero

Corrupted creatures have 25 purple soul fragments and have a 1 in 10 000 chance of gaining an ability upon evolution

They can also gain a new ability if they had one as an evolved creature

They need 35 to 50 years of absorbing mana or devouring 50 to 75 soul fragments as well as devouring 5 evolved creatures in order to evolve into a corrupted creature