Called by the Grave

Called by the Grave centers on a point of your choosing with in 40 feet of the caster.  Once triggered the ground erupts spilling forth 10 undead zombies of whatever creature triggered the spell.  These undead will be 1/4 the level of the opponent that triggered the spell.  For example: A dragonborn triggered the spell, 10 undead zombies dragonborn will crawl out of the ground and attack for four turns or intel dispelled.