Anyone with OP seraphina? I tried and can only clear in 22 rounds. Don't have any pull units that can survive chest.
Try not to CC on chest map, or just let it end after 5T, during the boss map, you could actually use unit that swap/pull the boss out. If not if your damage is high enough just kill everything within 15T.
What is CC? I don't have a pull/swap unit that is strong enough to survive the chest dmg
CC is Crowd Control
example: stun, silence, sleep, etc.
If you can survive the chest dmg, try bring some def and mag potion and used it when their skill is ready. =) hope that helps.