From my understanding and someone can correct me on this.

Risen cannot be named and will show up as a <creature> Risen. So rat risen, goblin risen, ect. You can see through their eyes and command them to move room by room or instantly call them to you. They can't speak or communicate, so its not like a familiar.

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You say, "I don't help your kind"
Necrobaby walks over and kicks you!
Necrobaby says, "Your more my kind than you are yours"