Bind Soul to Corpse.

Choose a pile of bones or a corpse of a Medium or Small creature within 20’. If any soul is free and willing, the target will have the soul bound to it. It will have all memories of the soul and free will with all its hit points, but the creature is an ally to you. It obeys your verbal commands requires bonus action. The target becomes a skeleton if you chose bones or a zombie if you chose a corpse.
This spell neutralizes any poisons and cures normal diseases afflicting the creature when it died. It doesn't, however, remove magical diseases, curses, and the like; if such effects aren't removed prior to casting the spell, they afflict the target on its return to life.
The target takes a −4 penalty to all attack rolls, saving throws, and ability checks. Every time the target finishes a long rest, the penalty is reduced by 1 until it disappears.

Casting this spell to bind a soul to a creature that has been dead for one year or longer taxes you greatly. Until you finish a long rest, you can't cast this spell again, and you have disadvantage on all attack rolls, ability checks, and saving throws.
* - (a drop of blood, a piece of flesh, and a pinch of bone dust)
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you bind souls to two additional undead creatures for each slot level above 3rd. Each of the creatures must come from a different corpse or pile of bones.
Above 6 level you can bind souls to creatures of large size, and you can prepare a fresh corpse to be used as a simulacrum for the soul. * - (a diamond worth at least 500 gp, which the spell consumes)
Using level 9 spell slot all piles of bones or corpses within 150’ have souls bound to them. * - ( diamonds worth at least 20,000 gp, which the spell consumes)