Spider Climb. The Arach 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 Arach knows the exact location of any other creature in contact with the same web.
Web Walker. The Arach ignores movement restrictions caused by webbing.
Poison Immunity. The owner of this demon is immune to this Arach's poison and it's bristles.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 15 (2d8 + 3) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 20 (4d8) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.
Web (Recharge 5–6). Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).
Bristles (Recharge 6). Ranged Weapon Attack: +3 to hit, range 10/20 ft., one creature. Hit: The target is blinded by the bristles for 1 minute.
Description
The Arach appears as an enormous spider, almost as large as a wild boar. Its eight dextrous legs are capable of skillful manipulation, allowing the demon to jump as high as ten feet and grasp its opponents by the face. The Arach has three powerful abilities. The first is the gossamer spell, shooting a luminescent web that puts one in mind of the silk of a glowworm— an adhesive that fades out of existence after a few hours. The second is the vicious stinger that protrudes from its abdomen, the venom of which is capable of killing a grown man, if the impalement on the spike does not do the job first. Finally, rather like some breeds of tarantula, the Arach is capable of releasing the bristled hairs from its back to float in the air, scourging its opponents’ skin and even blinding them. Only its summoners are immune to these bristles, as well as the Arach’s venom.