Unformed polymorphism

This spell transforms the target's body into an uncontrollable form, long, lumpy, and springlike seemingly without bones. The target must make a Wisdom saving throw to avoid the effect. The spell has no effect on shapechangers or creatures with 0 hit points.

The transformation lasts for the duration, until the target drops to 0 hit points, or if the target succeeds the save on a following turn.

The target takes 5d8 bludgeoning damage and becomes Stunned for the spell's duration.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th