I'm not a big fan of energy games, and I actually gave a very bad first review to this one, only sticking to it because I love the graphism and the gameplay. After playign for 2 weeks, it appears that this one is very balanced around it. Also note that you have no less than 4 different activities using different energy systems (Energy for dungeons, Tickets for PVP, Tokens for Trials, Shards for Raid), which leads to much playtime every day without spending any money. Far too much playtime, to such point that the devs added a way to spend Tickets and Tokens faster if you don't have much time.
Bugs... I poisoned an enemy, then kill him with a club hit... at next battle on the same place, he was here, poisoned, and die immediatly.
My flame spell heals ennemy...