Create Undead land

Choose up to three of any size corpses within range. Each corpse becomes a patch of bones under your control.

As a bonus action on each of your turns, you can mentally command any creature you animated 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.

each patch can cast one spell or unarmed strike of the being turned +3d4 Necrotic per turn and make a grapple check if the target fails the check they then become prone and if the being is of the same size or lower they are then held in place till they pass a str check of 16 the patch will relentlessly target a held being 

The patches of bones that are under your control can only move 5ft per turn unless it is in blood it then becomes more aggressive and it then moves 15ft per turn if necessary

At Higher Levels. When you cast this spell using a 4th-level spell slot, you can animate or reassert control over four patchs. When you cast this spell using an 6th-level spell slot, you can animate or reassert control over six patchs. When you cast this spell using a 8th-level spell slot, you can animate or reassert control over twelve patchs.