Uraldor’s Undead Abomination

This spell creates an undead servant. Choose a pile of bones or a corpse of a Large creature within range. Your spell imbues the target with a foul mimicry of life, raising it as an undead creature. The target becomes a skeletal (if you chose a pile of bones) or zombified (if you chose a corpse) version of that creature. Use page 282 of the Dungeon Masters Guide for reference  and work with your DM to create a stat block for the animated creature if an appropriate one does not already exist. The animated creatures Challenge Rating should not exceed 1/2 of your character level.

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 120 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 reasserts your control over up to two creatures 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 7th level you may animate or reassert control over a Huge creature. The C/R of the animated creature may not exceed your character Level. When you cast this spell using a spell slot of 9th Level you may animate or reassert control over a Gargantuan creature and the C/R of the animated creature may not exceed your character Level +5. The creature must come from a corpse or pile of bones of the appropriate size category.