Carrion Crawler - epic

Keen Smell. The carrion crawler has advantage on Wisdom (Perception) checks that rely on smell.

Spider Climb. The carrion crawler can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Multiattack. The carrion crawler makes two attacks: one with its tentacles and one with its bite.

Tentacles. Melee Weapon Attack: +8 to hit, reach 10 ft., one creature. Hit: 6 (1d4 + 4)poison damage, and the target must succeed on a DC 15 Constitution saving throw or be poisoned for 1 minute. Until this poison ends, the target is paralyzed. The target can repeat the saving throw at the end of each of its turns, ending the poison on itself on a success.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:  8 (2d4 + 4) piercing damage.

Skitter. when struck by a melee attack the carrion crawler can increase its speed to 60ft  for 1 round and does not provoke opportunity attacks.

Poison Cloud. when hit by a ranged attack the carrion crawler emits a noxious cloud from glands under its many legs. The cloud heavily obscures a 15ft radius around it for 3 rounds. Creatures starting their turn in the cloud must succeed on a DC 15 Constitution saving throw or take 6 (1d4+4) poison damage.

Bile Spew (recharge 4-6). at 3/4 hit points the carrion crawler can spray a poisonous mucous from its gullet in a 15ft straight line once per round as an additional attack. Creatures in the affected area must make a DC 15 Dexterity saving throw or take (1d4+4) poison damage, or half the damage on a successful save. All creatures struck by the bile spew have disadvantage to hit for 1 round due to the noxious stench clinging to them. 

Frenzy. at 1/2 hit points the carrion crawler movement speed is increased to 60ft and it increases its multiattack to 3; one tentacle attack and two bite attacks.

Swallow. At 1/4 hit points the carrion crawler goes berserk and attempts to swallow a random creature and escape. The carrion crawler makes one bite attack against a Medium or smaller target Within range. If the attack hits, the target is also swallowed. While swallowed, the target is blinded and restrained, it has total cover against attacks and other effects outside the carrion crawler and it takes 6 (2d4+4) acid damage at the start of each of the carrion crawler’s turns. A carrion crawler can have only one creature swallowed at a time.

If the carrion crawler  takes 15 damage or more on a single turn from the swallowed creature, the carrion crawler must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 10 feet of the carrion crawler. If the carrion crawler dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 15 feet of movement, exiting prone.