Swallowing Living Sands

You summon a purple worm from the depth of the elemental planes which swallows one creature that you can see within range. On a failed dexterity saving throw the target is swallowed and the worm burrows under the sand. Such creature is blinded and restrained, it has total cover against attacks and other effects outside the worm, and it takes 6d6 acid damage at the start of each of its turns. A swallowed creature can repeat a dexterity or strength saving throw at the end of its turn. If successful the creature gets ejected and lands prone in the nearest unoccupied space from the point where it was swallowed.