Chant of Death

Start clapping quietly, then gradually crescendo. When climax is reached shout, "Leve non, ondèd vanyan sòlda! Se pou lespri mwen anbrase ou! (An undead chant for summoning zombies, meaning unknown.)"

A humanoid rises out of the ground, dealing 1d4 damage to anyone 5 ft near it. At the start of your next turn as a zombie that is under your command for 30 min., following your verbal orders to the best of its ability.

 A character can summon the zombie for 5 extra minutes each level, above level 1. 

At the end of the time, the ritual has to be repeated, or else, the zombie is turned against you, with an advantage of surprise.