Exogorth, Adult

Armor Class 18 · Hit Points 247 (15d20 + 90) · Speed 50 ft., burrow 30 ft.

Tunneler (Trait). The exogorth can burrow through solid rock at half its burrow speed and leaves a 10-foot-diameter tunnel in its wake.

Legendary resistance (Trait). If the exogorth fails a saving throw, it can choose to succeed instead.

Gargantuan Strength (Trait). The exogorth's melee weapon attacks are considered enhanced.

Siege Monster (Trait). The exogorth deals double damage to objects and structures.

Space-borne (Trait). The exogorth can survive in the vacuum of space.

Multiattack (Action). The exogorth makes two attacks: one with its bite and one with its tail.

Bite (Action). If the exogorth takes 30 damage or more on a single turn from a creature inside it, the exogorth must succeed on a DC 21 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the exogorth. If the exogorth dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 22 (3d8 + 9) kinetic damage. If the target is a Large or smaller creature, it must succeed on a DC 19 Dexterity saving throw or be swallowed by the exogorth. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the exogorth, and it takes 21 (6d6) acid damage at the start of each of the exogorth's turns.

Tail (Action). Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 19 (3d6 + 9) kinetic damage. If the target is a creature, it must succeed on a DC 19 Strength saving throw or be knocked prone.