Thyn's Sacrificial Animate Dead

This spell creates an undead servant is raised by your own life force. Choose a pile of bones or a corpse of a Medium or Small humanoid within range, after which you must take a triple the spells level of unavoidable necrotic damage. Your spell imbues the target with with your own life force, raising it as an undead creature. The target becomes a skeleton if you chose bones or a zombie if you chose a corpse (the DM has the creature's game statistics).

On each of your turns, you can mentally command any creature you made with this spell (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 or the spell ends.

The creature is under your control for 12 hours, after which you will take additional damage equal to double the spells level in necrotic damage, and the undead raised with this spell no longer follow your commands. To maintain control of the creature for another day, you must cast this spell on the creature again before the current 12 hour period ends. This use of the spell reasserts your control over up to 2 creatures you have animated with this spell, for an additional 12 hours, rather than animating a new one.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you animate or reassert control over one additional undead creatures for each slot level above 2nd.