I think the Lord Zomm third skill is buggy.
The description read: 22% max health/1 energy + 22% max health / 1 energy per zomm minion.
When I use the skill with 3 zomminions, the energy is gained but health is surely not updated.
In the boss dugeon run, I manage to used that skill 4 times, that should be 400% hp increase but Im pretty sure his HP does not increase at all. (my zoom hp was 10k at default, and a 2k hit already eat my 1/5 hp bar)