Bugged on the boss for level 5. Looked like i killed him while he was splitting. afterwards, i was left with one unkillable version of the boss, which finally got me. after that, any level i fought, it was if i had one of those bosses flying around unseen shooting at me.
hmm... bug/exploit. win a battle with 'all armor' equippped. second time around, you have no energy abilities. if you win that battle, unequip it and you are left with infinite shield.
 "Dragon Rescue"){kind=icon}
 "Enigmata"){kind=icon}
that bug is fixd with the latest update, thanks.