BlackWarGreymon, created from 100 Control Spires to do evil, died being a hero.

But as death start to grip him, fate has other ideas. Now in Equestria, his life can start again. Making unforgettable friends, facing deadly foes and experience feelings and emotions he never thought would ever happen to him.

(note: this story takes place after the events in Digimon Adventure 2 episode BlackWarGreymon's Destiny and some time after MLP FIM season 4)