Necromancy Scholar of Micolo

Micolo (or one of his scholars) taught you how to overcome the limits of common necromancy. When you restore someone to life using a necromancy spell, there is no limit as to how long they can be dead. Using Animate Dead, there is no limit on the number of undead you can create, though you can only command one at the time, the rest is following a general order (such as "wander the hallways and kill everyone you encounter").