Sand Worm A5E
CR 15 monstrosity
Gargantuan monstrosity, chaotic evil
When the worm emerges from under sand, each creature within 30 feet makes a DC 24 Constitution saving throw, falling prone on a failure.
The worm can tunnel through earth and solid rock, leaving behind a 10-foot-diameter tunnel.
Actions
The worm attacks two different targets with its bite and its tail stinger.
Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 25 (3d10 + 9) piercing damage. If the target is a Large or smaller creature it makes a DC 19 Dexterity saving throw. On a failure the target is swallowed. A swallowed creature is blinded and restrained it has total cover from attacks from outside the worm and it takes 24 (7d6) acid damage at the start of each of the worms turns.
Melee Weapon Attack: +14 to hit, reach 10 ft., one creature. Hit: 19 (3d6 + 9) piercing damage and the target makes a DC 19 Constitution saving throw taking 42 (12d6) poison damage on a failed save or half damage on a success.
Reactions
When a creature makes an opportunity attack on the worm, the worm attacks with either its bite or its tail stinger.
Source: Monstrous Menagerie (EN Publishing) · License: OPEN GAME LICENSE Version 1.0a details