Animate Dead

Information

 * The caster summons a skeleton minion, at (0.75*[Caster's level]), from the corpse of a fallen enemy to fight alongside the party for a short time, although, as a puppet of the caster, it will not use any talents or spells without specific instruction. The corpse used in the summoning determines the type of skeleton summoned (Warrior, Rogue or Mage).


 * Spell Combinations: Advanced Reanimation.

Exploits
Similar to the ranger summoning exploit, it's possible to have two animated skeletons. If the first animated dead was a mage, the mage will assume the tactics of the dead npc and be able to use spells/talents which do not appear in it's hotbar when directly controlled. If that npc mage had the spell Animate Dead there is a chance it too will summon a second skeleton from a corpse whose talents will appear in your groups Spells and Talents section (however the mages will not). Furthermore, neither the caster nor the skeletal mage will have a upkeep cost for the second skeleton.

This is the only explanation I could think of for this occurring, however if someone has more information please feel free to correct me. The screenshots were taken in the Ruined Temple during the quest for The Urn of Sacred Ashes, the mage in question was the mage in the group at the base of the stairs after acquiring the South East Chambers Key. Not tested with v1.02a.