Mass Zombie

Area 
Similar to Zombie, but reanimates all relatively complete dead bodies in the area of effect. As with Zombie, different sorts of corporeal undead are made from different qualities of bodies; a mix of undead types may result from a single Mass Zombie. A corpse must be lying in its tomb or at its place of death to be affected by this spell; otherwise, it won’t be affected. 
Corpses in graves up to 4 yards deep will claw their way up to the surface to join their new master. 
Undead created by this spell become the loyal servants of the caster. 
However, they can only be commanded as a group; individual members of the horde cannot be given separate tasks. If this spell is cast ceremonially, the leader of the circle is the master. The zombies regard the other members of the circle as his lieutenants; their orders are obeyed, but the master’s orders take precedence. Optionally, the mages involved in the casting may divide the horde equally, each mage becoming master to his own segment. 
In most likely casting locations, this spell will raise (RxR)/2 undead (round down), where R is the radius of the spell. It might yield fewer undead in an upper-class cemetery where the dead have lots of elbowroom in their crypts, or more at a mass grave. 
Undead created with this spell are identical to those created with the Zombie spell. They use the same templates and are affected the same way by magic.

Duration: Permanent. 
Base cost: 7. Minimum radius 2 yards. 
Time to cast: A number of minutes equal to the radius. 
Prerequisites: Zombie and Charisma 2 or better.