great game, but I found 2 problems
1- some upgrades are so bad that made me restart my character...
2- the upgrade with the same name gives you no bonus to your special hability, so, a better prist is as bad as a low one...
the goblin on cave of trial 5 is really an easy to solve problem, you don't need to kill it to bet the cave, just stun him with mermaids and drive him back with succubus, also use a lot of fast respaw peon since you produce them fast enought to protec you. the real problem is CoT 4 ...
if u wanna win u NEED to chose red fire and use mana atks until the end just protecting urself, if ya don't do it, then knows that red fire is the strongest and sea water the second strongest