on C2 i nearly made it. 4 swarmlings left and i forgot to remove the gems so that they were killed before they reached the freeze/curse zone near the tomb. i really was short of crying ....
Third ability is Wake of Eternity and it's unlocked about 10 stages before X hex where you beat the game. Deals 30% of (upgradable) dmg to all enemies in range and banishes 1/5 of them. I don't like it becouse of this banishment, it prevents some nice tricks with poison shrine.
thanks for the info. i assume on c2 you get just another gem mastering ? if so i will feel better, because i won't try C2 in the next time .... too angry.