The target must be under 5hp if they are for 1 action you transform the target into a zombie.

The zombie is then under your direct control. It's strength is reduced to 50% of the original strength and automatically fails any magic or ability saving throes and it's speed is reduced to 50% of the original speed. The zombie's health is automatically set to 20hp and it's AC is 8. The zombie retains any of it's ability's (eg. spells or race features). the zombie is immune to physic and lightning damage and have resistance to bludgeoning and ice damage. the zombie takes extra damage from fire and slashing damage. The zombie remains under your control until you release the spell. when you release the spell the zombie will immediately die. there is NOT a limit to how many zombies can be created though for each zombie after your first, reduces your movement speed by 5ft. your AC drops by 5 wile you are controlling a zombie.

when you perform this spell clerics and paladins are given +1d4 to damage rolls against the caster