My Little Pony: I Came to Equestria from the Abyss

When Jiang Mowen, no, Lord Mowen regained consciousness, he found himself in a world called the Abyss. The Abyss had twisted his appearance, and he was no longer human.

When he finally managed to leave the Abyss, he unexpectedly encountered two alicorns he had once known very well. Only, there seemed to be something wrong with his memories now?

[Not a dark fanfic, single female lead: Twilight Sparkle, no System]