Chuul, Acheron-Corrupted

Family: Chuul

Large aberration, chaotic evil

Armor Class 16 (natural armor)
Hit Points 93 (11d10 + 33)
Speed 30 ft., swim 30 ft.

19 (+4) 10 (+0) 16 (+3) 5 (–3) 11 (+0) 5 (–3)

Skills Perception +6
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 60 ft., passive Perception 16
Languages understands Deep Speech but can’t speak
Challenge 5 (1,800 XP)


  • Amphibious. The chuul can breathe air and water. Lifeless Aura. The Acheron-corrupted chuul exudes an aura of deterioration and lifelessness that manifests as an unpleasant itching up to 20 feet from the chuul. Creatures in the aura other than fiends and Acheroncorrupted creatures can’t regain hit points.
  • Sense Magic. The chuul senses magic within 120 feet of it at will. This trait otherwise works like the detect magic spell but isn’t itself magical.


  • Multiattack. The chuul makes two pincer attacks. If the chuul is grappling a creature, the chuul can also use its necrotic tentacles once.
  • Pincer. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage. The target is grappled (escape DC 14) if it is a Large or smaller creature and the chuul doesn’t have two other creatures grappled.
  • Necrotic Tentacles. One creature grappled by the corrupted chuul takes 10 (3d6) necrotic damage and must succeed on a DC 14 Constitution saving throw or be poisoned for 1 minute. The chuul regains hit points equal to the necrotic damage it deals. Until this poison ends, the target is paralyzed and its hit point maximum is reduced by the amount of necrotic damage it takes. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.


The Acheron legion doesn’t limit its depredations to the land but also drains the seas of life and vitality. Chuuls that lurk in lightless depths often embrace this corruption not only to survive but because it grants them the opportunity to demonstrate unparalleled mastery of the waters. Corrupted chuuls usually serve as amphibious warriors in the armies of the fiends but some are guardians of underwater strongholds. This monstrous crustacean is a sickly, sallow color, but its oversized claws clack together menacingly.

Acheron Corruption

Acheron corruption is usually embraced by creatures living in the desolate, barren wastelands that the Acheron legion produces, if only as a means to survive. While this legion controls an area, live births from any creatures are rare and produce corrupted creatures that grow to maturity with supernatural speed. Creatures with an Acheron corruption seem sickly and pale, and most have vacant, hollow gazes.

Acheron corruption grants the following trait.

Lifeless Aura. The Acheron-corrupted creature exudes an aura of deterioration and lifelessness that manifests as an unpleasant itching up to 20 feet from the creature. Creatures in the aura other than fiends and Acheron-corrupted creatures can’t regain hit points or gain temporary hit points.

Section 15: Copyright Notice

Sandy Petersen’s Planet Apocalypse, © 2021, Petersen Games.

This is not the complete section 15 entry - see the full license for this page