You can cast this spell only at night. Within range choose up to 3 humanoid corpses (size M or S). Each corpse becomes a ghoul under your control. As a bonus action on each turn, you can mentally command any/all the creatures within 120'. Once given an order, the creature continues to follow it until its task is complete. The creature is under your control for 24 hours, after which it stops obeying your commands. To maintain control, you must cast this spell on the creature before the 24-hour period ends. This use of the spell reasserts your control over up to 3 creatures you have animated with this spell, rather than animating new ones.
When you cast this spell using a 7th-level spell slot, you can animate or reassert control over 4 ghouls. Using an 8th-level spell slot, you can control over 5 ghouls or 2 ghasts/wights. Using a 9th-level spell slot, you can control over 6 ghouls, 3 ghasts/wights, or 2 mummies.
one clay pot filled with grave dirt, one clay pot filled with brackish water, and one 150gp black onyx stone for each corpse