Undead Servant

This spell creates an undead servant. Choose the corpse of a Medium, Small or Tiny creature with a CR rating of 0, within range. Your spell imbues the target with a foul mimicry of life, raising it as an undead creature. The target corpse becomes an undead version of the creature (the GM will provide the creature's game statistics).

On each of your turns, you can use a bonus action to mentally command any creature you made with this spell if the creature is within 60 feet of you (if you control multiple creatures, you can command any or all of them at the same time, issuing the same command to each one). You decide what action the creature will take and where it will move during its next turn, or you can issue a general command, such as to guard a particular chamber or corridor. If you issue no commands, the creature only defends itself against hostile creatures. 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 any command you've given it. To maintain control of the creature for another 24 hours, you must cast this spell on the creature again before the current 24-hour period ends. This use of the spell can reassert your control over one creature you have animated with this spell, rather than animating a new one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can animate or reassert control over one additional undead creatures for each slot level above 2nd. Each of the creatures must come from a different corpse. Using higher spell slots also allows the raising of higher CR creatures. 3rd = 1/8, 4th = 1/4, 5th = CR 1/2, 6th = CR 1, 7th = CR 2, 8th = CR 3 and 9th = CR 4. Reasserting control over higher CR creatures also requires the specific spell slot level or higher to do so.