Crescent

[MangaDex]

 

[SoLei]

Spoilers if you want to know about what happens:

Spoiler

Dellons = Snolled
If you don't play the game: Dellons becomes insane after his entire family and his lover dies. His goal is still to revive Claudia although so far all his attempts have continuously failed. And then in Season 4, he chooses to give himself completely to 'death' (the creature appearing in his skill) in order to have a chance at reviving Claudia (even though it seems this is not possible). Dellons cannot forget his vow and promise he made 1,500 years ago to Claudia about protecting her for all eternity.
Some info has been plagiarised from the 7k wikia^

TLDR: He becomes an insane death lord after Claudia dies
From episode 7:

Annihilation Knight Dellons:

Dellons "giving himself into death" and becoming this monster thing:

I am a big fan of Dellons
Dellons best boi
Dellons did nothing wrong

 

[MerriLee74s]

Thank I you @SoLei !!!

It sounds really interesting 😄