Wall of Flesh

A squirming wall of bodies, groping arms and tentacles, and moaning, biting mouths heaves itself up from the ground at a point you choose. The wall is 6 inches thick and is made up of a contiguous group of ten 10-foot square sections. The wall can have any shape you desire.

If the wall enters a creature's space when it appears, the creature makes a Dexterity saving throw , and on a success it moves up to its Speed to escape. On a failed save, it is swallowed by the wall (as below).

When a creature enters the area for the first time on a turn or starts its turn within 10 feet of the wall, tentacles and arms reach out to grab it. The creature makes a Dexterity saving throw or takes 5d8 bludgeoning damage and becomes grappled . If the creature was already grappled by the wall at the start of its turn and fails its saving throw, a mouth opens in the wall and swallows the creature. 

A creature swallowed by the wall takes 5d8 ongoing bludgeoning damage and is blinded , deafened , and restrained .

A creature grappled or restrained by the wall can use its action to make a Strength saving throw against your spell save DC. On a success, a grappled creature frees itself and a restrained creature claws its way out of the wall's space, exiting to an empty space next to the wall and still grappled.