Death embrace

A humanoid figure made by different parts of skeletons appears in a point you decide within range. The figure can try to grapple one target and force it to lay down. The target must succed a STR saving throws or be knocked prone and be restrained. The creature can’t be more than a size bigger than the caster. Every turn as a bonus action you can inflict 1d6 necrotic damage (reducing the max HP by half of the damage) or you can move the abominion to another point within range to try to grapple another creature. The humanoid creature uses the Skeleton stat block and can only do the grapple action. If someone tries to run away from the creature, it can use its reaction to try and damage the enemy. Use the Shortsword attack in the stat block. If a creature isn't able to escape the grapple within the minute you concentrate onto this spell the skeleton hardens itself becoming solid metal increasing the DC for escaping by 5.

At higher level. The necrotic damage increases by 1d6 per slot level used above 2nd.