Arachnopent Elder

Web Walker. The Arachnopent ignores movement restrictions caused by sticky webbing.

Younglings. If the Arachnopent Elder is killed by slashing or piercing damage, or if over half of the damage taken is of those types, the body will rupture upon death allowing 3d12 Arachnopent Hatchlings to spill out and scatter in all directions.  Any that encounter a creature in their path to escape will institutionally attack that creature.

Multiattack. The Arachnopent makes one sting attack, and two bite or tail attacks.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 17 (3d6 + 6) piercing damage. On a hit, the target must make a DC 17 Constitution saving throw. On a fail, the target takes 2d6 poison damage and are considered condition]poisoned[/condition].  On a success, the target takes half as much and is not poisoned.

Sting (Recharge 5-6). Melee Weapon Attack: +8 to hit, reach 10 ft., one creature. Hit: 17 (3d6 + 6) piercing damage. On a hit, the target must succeed on a DC 17 Constitution saving throw. On a fail, the target takes 2d6 poison damage, is considered poisoned, and is infected with an Arachnopent Hatchling. On a success, the target takes 2d6 poison damage and is not considered poisoned. Also on a success, the hatchling does not infest and the ability automatically recharges.

Tail. Melee Weapon Attack: +8 to hit, reach 10 ft., one creature. Hit: 17 (3d6 + 6) bludgeoning damage. On a hit, the target must succeed on a DC 15 Strength saving throw or be knocked prone.

Web. Ranged Weapon Attack: +6 to hit, reach 30/60 ft., one creature. Hit: The target is restrained by webbing shot from the mouth of the Yuan-achnid. As an action, a restrained creature may make a DC 15 Strength (Athletics) check to break free.  Webbing has an AC of 10 with 5 hit points, is vulnerable to fire and slashing damage, but is immune to poison and psychic damage; any bludgeoning damage transfers tot he restrained creature.

Constrict. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 15 (2d8 + 6) bludgeoning damage and the target is grappled (escape DC 17). Upon a successful constrict action, the Arachnopent may make one bite attack or one sting attack at advantage.

Slippery and Slithery. If a creature within 5 feet of the Arachnopent makes an attack against it, it may choose to swiftly move up to ten feet away without provoking an attack of opportunity, avoiding the attack.  This must be declared before the result of the roll is known.  If it has a creature grappled via its constrict attack, that creature is no longer considered grappled.