Necromancy:
If your thrall dies, cast this on them to summon a skeleton or zombie in their place. This summon would be a permanent thrall.
Summon Lesser Creature:
Use this on a local animal to use it as a pet until you log out. It wouldn’t work on boss or corrupted animals. This thrall would leave once you logged out.
Mind Control:
Use it on any T2 thrall to instantly enslave them to your service until you log out. This thrall would leave once you logged out.