You may have heard of the spell permanency trick. If not, it consists of two methods with the same end result:  Cast spell X on NPC -> cast Dweomer Shield on the NPC -> cancel Dweomer Shield  Cast spell X on NPC -> cast Reflection Shield on the NPC -> cancel spell X -> cancel Reflection Shield The result of the trick is making spell X permanent on the NPC (usually but not necessarily a follower). Both methods work for most spells, though there are some for which only the first or second one works. Now, the trick can be used to make non-recruited followers permanent, where non-recruited stands for summons, sentients with dominated will, controlled animals and created undead. The spell permanency trick is obviously a bug and it has been partly disabled because of it in Drog's Unofficial Arcanum Patch. The part of the trick that has been disabled is making non-recruited followers permanent. If you, however, like to think of the trick as a feature rather than a bug and are interested in having both Arcanum patched with the UAP and the ability to make non-recruited followers permanent, download THIS FILE and place it in your Arcanum/data/rules/ directory. It's the SpellList.mes file from the latest UAP in which I have undone this one particular fix. Have fun!