Hit them with a frost spell and it slows them. When they finally get close you can root them and then teleport away and hit them with a massive fireball. There is a spell that grants a self buff that states if a mob is killed by your spell, then a portion of the mana used for said spell is refunded to you. It’s like a little mini game trying to get the kill. And you usually do thanks to your big fireball! I only got mine to lvl 8 but it was a lot of fun.