Black Clover (tv) Episode 115 -

Upon learning he was a mere pawn, Patry (the leader of the Eye of the Midnight Sun) is consumed by ultimate despair. This transforms his four-leaf clover grimoire into a five-leaf grimoire , and he becomes a "Dark Elf," attacking everyone in a blind rage.

The elf Ronne is revealed to be possessed by Zagred, who has been pulling the strings for 500 years. Black Clover (TV) Episode 115

The elf Ronne's betrayal pulls back the curtain to reveal a truly fiendish puppetmaster who's not nearly done pulling the strings- Black Clover T.V. Media Review Episode 115 - Anime Solution Upon learning he was a mere pawn, Patry

Zagred admits he tricked the ancient humans into massacring the elves to plunge their leader, Licht, into despair. and he becomes a "Dark Elf