Long story short she tried to defeat Corruption, with the confidence of her abilities, and failed. Most of her cybernetic parts were "replaced" with the Enenra, looks like Corruption doesn't like that robot stuff.
Armagedon is now known as Miracle and she is a shade, short summary if you don't remember, a shade in the Enenra ranks is like a zombie except more deadly and is controlled by an Enenra that has a conscious of sorts.

Corruption: Ponies these days…never accepting themselves…disgusting.

MlE FiI/Enenra/Art © (me)
Original design © arianaaviles
MlpFim © Hasbro and Fausticorn