Belphegor

 

Belphegor is the main boss in the Storyline. It can be found in Boss Raid at Tuesday, Thursday and Saturday.

In the Storyline, it's said that "it casted a terrible curse of vice and vanished into the darkness" (sic)

Is the one who cursed Damien, turning him against the humans.

Levels and Drops of Belphegor
You can find him with the following features:

Belphegor's Elements
Belphegor got Fire and Poison attacks depending on the day: