Take me as your master. I have available slots. Just visit the master tab and input y8n45.
The rewards are very useful. The mage’s Knowledge set reduces your fireball skill’s cooldown -1.
The priest’s Resurrection set is also OP as you can mix 3 pieces with another set and get the the 30% bonus to Magic Atk and 30% HP from it.
Good luck and more health to you!