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.
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.