Kang-Kung
Upon arriving at the boss area, you are greeted with what seems to be a regular boss enemy. But he is quickly killed by an even bigger baddie. The actual boss of the level, Kang Kung. Kang kung is a two-headed yeti that has a bad temperament and various skills that fit his temper.
He will sometimes do a tantrum which will cause objects to fall from above. This does no damage but is a preparation for even greater attacks which if the objects are left alone, he will use them to deal heavy damage to a single hero or damage to all the heroes.
Aside from his basic attack, his other attack that doesn't rely on the fallen objects is his Frost breath attack. This does moderate damage to all heroes.
The main strategy of the fight is to bring a couple of heroes with heavy hitting Area of Effect skills. If they are of the nature element, then better. Your goal is to save your AoE strikes for when he does a tantrum that causes objects to fall. AoEs deal damage to these objects as well effectively removing them from his possible next attacks. Keep repeating this strategy and he will go down easily.