Arachnochirus

Spider Climb. The Arachnochirus 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 Arachnochirus knows the exact location of any other creature in contact with the same web.

Web Walker. The Arachnochirus ignores movement restrictions caused by webbing

Multiattack. The Arachnochirus makes 2 attacks: one with it's claw and one with it's bite.

Claw. Melee Weapon Attack: +7 to hit, reach 10 ft., 1 target. Hit:  12 (2d8 + 3) Bludgeoning damage. 

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 10 (2d6 + 3) Piercing Damage

Stinger. Melee Weapon Attack: +7 to hit, reach 15 ft., 1 target. Hit:  10(2d6 + 3) Piercing Damage, and the target must make a DC 15 Intelligence saving throw, taking 14 Psychic damage on a failed save, or half as much damage on a successful one. In addition if the target fails the saving throw they believe that they have been polymorphed into a random creature listed below when in reality they have not been and it's just the toxin's setting into their mind. They may attempt to make the saving throw again at the end of their turn or whenever they take damage. Once a creature has succeeded the saving throw they are immune to this toxin for 24 hours.

Web (Recharge 5-6). RangedWeapon Attack: +7 to hit, range 30/60 ft., 1 target. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 14 Strength check, burting the webbing on a success. The webbing can also be attached and destroyed (AC 10;  HP 5; vulnerablility to fire damage; immunity to bludgeoning, poison, and psychic damage).