Any tips on fighting these guys? No matter what I do they always end up crushing my team. The closest I've gotten is probably half way before they demolish me. I can take down the Golems without breaking a sweat but for some reason these guys give me so much trouble and their supposed to be the easiest boss in the caverns.

It's all about dps! Their buffs are removed when they take enough damage and if the buffs aren't removed it makes the battle more difficult. Their first buff will do massive damage to your pets if not removed quick enough, the second buff just shields them and absorbs a certain amount of damage. Their full mana attack will stun your first pet.

The strat is really just to deal as much damage as possible once they've got the buff up, consider switching to a tank/cannon/cannon party if you don't already use one.