Normally residing in the world's north pole, a dreaded hellish region of pure magical energy, are the insanely gigantic and powerful Daemon Princes. Since Daemons are constructed of pure energy, it is difficult for physical weapons to harm them. Only the strongest enchanted weapons and spellcraft can put a dent into these monstrosities.
These wildly mutated warriors tower over men, and sometimes will be able to take on entire armies with their massive powers and abilities. They cannot be killed but merely banished back to the Chaos realm to which they came.