Zombie Summoning

Special 
Calls the nearest zombie to the caster (for the purposes of this spell, a zombie is any undead creature created with the Zombie spell). Range is irrelevant. Upon a successful casting, the caster knows the location of the closest zombie (any known zombies may be excluded if the caster mentions them before casting) and how long it will take to reach him. The zombie moves toward the caster as fast as it can, until it can see him or the spell ends. If it can reach the caster, it stays nearby, without attacking or obeying, until the spell ends. The spell is broken by any attack on the zombie, and if the zombie fails to reach the caster before the spell duration ends, it will simply turn and go about its business, or wander off if it had none. 
Zombies will not answer the summons if it conflicts with their master’s orders (so you cannot Summon zombies away from whatever they were guarding, for instance).

Duration: 1 minute. 
Cost: 5 to cast. 2 to maintain. To call many zombies, double the cost. All zombies within a 10-mile radius (more for a very successful casting) will be summoned. 
Time to cast: 4 seconds. 
Prerequisite: Zombie.