Q. How Do I kill Belial???
 
 
 
A. This is after all the final battle. There's no turning around or holding back. Use all your magic and
might to kill him! As you might notice, every time you kill an Imp Lord you will get an ancient stone. Use them now! They will allow you to cast level 5 magic at no cost. And the level 5 prism spell is STRONG.
Of course if you still have some guardian orb it won't hurt to use them now :)