Great spell to create minions, but they will turn on you eventually. You get a message "Skeleton/mummy/Kobold snaps out of it". The creatures will attack shop keepers, armor smith, baker and priests. So make sure you have ditched them before you visit a vendor, unless you want his stuff for free. Also avoid resting with minions that weren't recently summoned. The duration that a minion is friendly depends on your Charisma value.
If the minions are freed via the chat menu, the spell is a great source of all of death spellcasting skill, weapon skill and experience, especially when combined with Beast Mastery III and its shared experience allocation.
Learned from: Book of raise dead.