How can I fight Belial?

Hint 1 of 5:

Unlike a lot of the creatures you'll fight, this Belial seems to have good
close and ranged attacks.

Hint 2 of 5:

But I did find his close attacks were more dangerous.

Hint 3 of 5:

Also, I noticed that Belial drains your life force and magic towards the end
of the fight, but never at the beginning.