Animate Dead Monster

Choose a pile of bones or a corpse of a Medium or Small Humanoid within range. The target becomes an Undead creature: a Skeleton if you chose bones or a Zombie if you chose a corpse.

On each of your turns, you can take 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 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 on its next turn, or you can issue a general command, such as to guard a chamber or corridor. If you issue no commands, the creature takes the Dodge action and moves only to avoid harm. 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.

an undead creature, uses the original creature's statblock altered as follows:
zombie:
1: the creature's type changes to undead and the alignment changes to neutral/evil
2: gains immunity to poison damage, the poisoned and exhaustion conditions.
3: gains proficiency in wisdom: +0, regardless of its wisdom score.
4: dex6(-2); int3(-4); wis6(-2); cha5(-3)
5-gains the trait: Undead Fortitude: If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Skeleton:
1: the creature's type changes to undead and the alignment changes to lawful/evil
2: gains immunity to poison damage, the poisoned and exhaustion conditions.
3: int6(-2); wis8(-1); cha5(-3)
4: The creature gains vulnerability to blungeoning damage

An undead creature cannot cast spells.
an undead creature loses multiattack and any traits that require living biological functions.

Using a Higher-Level Spell Slot. You animate two additional Undead creatures for each spell slot level above 3. Each of the creatures must come from a different corpse or pile of bones.