Create Greater Undead Beast

Choose a beast's corpse that's been dead for no less than 10 days, and its challenge rating doesn't exceed 3. Your spell raises the beast as an undead version of what it once was that's under your control, returning with all of its hit points. When a beast's raised by this spell, its type changes to Undead, gains darkvision to 60ft, immunity to poison damage and gains the Undead Fortitude trait.

On each of your turns, you can use a bonus action to mentally command any creature you made with this spell if the creature's within 60ft 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). You decide what action the creature takes and where it moves during its next turn, or you issue a general command to guard a chamber or corridor. If you issue no commands, the creature defends itself against hostile creatures. Once given an order, the creature follows it until its task is complete.

The creature's under your control for 24 hours, after which it stops obeying any command you give. To maintain control 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 reasserts your control over up to four creatures you've animated with this spell rather than creating a new one. When you lose control, the creature acts as it usually would, which might be attacking you or your allies.

At Higher Levels. When you cast this spell using a slot of 5th or higher, the challenge rating of a beast you can raise increases by 1 for each slot above 4th.