This is Crillal also the first boss in the game.
I really like him he's really cool design wise, whilst the wiki states "Crilall is a tall vampire " he's not freaking tall, look at him, tall as a fart.
The fight itself isnt really hard, unless you came unlevelled, for some reason he turns into a rat in middle of the fight, good for him i guess.
After defeating Crillal you can advance into the terminus prison, a really scary place.
BUT
Thats a story for another day, or another page