Animate Ghoul

You raise one Medium or Small humanoid corpse as a ghoul under your control. Any class levels or abilities the creature had in life are gone, replaced by the standard ghoul stat block.

At Higher Levels. When you cast this spell using a 3rd-level spell slot, it can be used on the corpse of a Large humanoid to create a Large ghoul. When you cast this spell using a spell slot of 4th level or higher, this spell creates a ghast, but the material component changes to an onyx gemstone worth at least 200 gp.