Arachemon (5e Creature)

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Medium fiend, neutral evil

Armor Class 18 (natural armor)
Hit Points 47 (4d12+15)
Speed 30 ft., climb 60 ft., fly 60 ft.

16 (+3) 19 (+4) 16 (+3) 9 (-1) 12 (+1) 12 (+1)

Saving Throws dex +7
Skills Perception +4, Stealth +7, Survival +4, Insight
Damage Resistances poison, fire
Condition Immunities paralzyed
Senses blindsight 10ft., darkvision 120 ft., passive Perception 14
Languages Spydric, Abyssal
Challenge 4 (1,100 XP)

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

Web Sense. While in contact with a web, the arachemon knows the exact location of any other creature in contact with the same web.

Web Walker. The arachemon ignores movement restrictions caused by webbing.


Multiattack. The arachemon summons one swarm of spiders in an adjacent space and makes two attacks with its claws.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d10 + 4) slashing damage.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d10 + 4) piercing damage plus 3 (1d6) poison damage and the target must succeed on a DC 16 Constitution saving throw or be poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Acid Web (Recharge 5-6). The arachemon exhales fire in a 15-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw. On a failed save, they are restrained and take 2d6 acid damage at the beginning of each of their turns. On success, they take 1d6 acid damage and are not restrained.

The arachemon is a creature with 8 pincer and a pair of large wings with four pairs of eyes. For its size, the creature is surprisingly light, typically weighing only about 70 pounds. Its hide matches the hue of the spiders it hosts, making it difficult to find individual spiders on the creature’s body unless one looks closely. By then, one is within range of the arachemon to dismember.

The arachemon is an unholy being recorded within the Arachnomicron. It functions as a symbiotic colony, with multitudes of spiders living on the surface of its body. It is a horrid sight to behold, even more so since these creatures usually live in broods. The arachemon constantly hunts down prey to feed its appetite as well as to care for its brood. However, they are notably extinct from Grisaire. All the records of them are recorded solely within Resoolt's lost book. It can be created if one secures the necessary sacrificial materials from the City of Ashes, which include eldritch essence.

What makes the arachemon particularly insidious is its symbiotic colony. As it is a host, the spiders it summons are entirely under its control and will attack threats to the arachemon. When the arachemon grows too weak to sustain them, the spiders devour the host and leave the carcass for a new host, cocooning its remains for 4 weeks time. At the end of this grisly ritual, a fresh, new, fully-grown arachemon is born of the cocoon. This new beast comes with its own colony of spiders and resumes its hunting once more. In an arachemon brood, many of these dormant cocoons can be found, waiting to be reborn.

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