Oh, ok my elemental is bugged I ranked that spell to level 12 and only got 1 extra spell. [0,2] First - Path Of Flames at level 4 and then nothing more.
I regards to the combat kings they aren't overpowered they are just really leet and give some big edges its like a 2-3 more items worth of power.
Love life steal, love magic torrent even on low mana characters because it boosts damage and thus life stolen, berserk is really nice because unless they are doing insanely more damage than you are regenerating from your attacks then you will recover more as your health drops and just kill them faster! I got my attack speed up to 3 attacks per second base dealing about 2-3k per hit between effects and base damage not even counting crits. So I heal a lot
Although you will be happy to know as pl4ton said things get really intense in chapter 7 my tank actually died in 1 of the solo arena matches when the dude shot out his nearly instant kill flame spell that follows you.