This creature is about 5 feet in diameter and resembles a bloated yellow bag of pulpy flesh with eight spidery legs. It has two long sharply-curved mandibles protruding from one end of it which you can assume is the front, though the creature seems to be lacking both eyes and a mouth.
Speed 30 ft., climb 20 ft.
Str 12, Dex 16, Con 16, Int —, Wis 12, Cha 3
The bite of a boneneedle secretes a thick, syrupy neurotoxin that destroys flesh and quickly breaks down bone. The chemical reaction causes the bones to weaken and become brittle. If the opponent fails his save against the poison’s secondary effect, its bones weaken, and it takes an extra 2 points of damage from any crushing or bludgeoning attack until all Dexterity damage dealt by marrow poisoning is healed. Cumulative bites do not increase the amount of extra damage beyond 2 points An opponent reduced to Dexterity 0 dies as its bones become too brittle to support its weight thus causing its body to collapse in on itself.
Bone Needle Poison; Sting—injury; save Fort DC 15; frequency 1/round for 2 rounds; effect 1d4 Dex; secondary effect target takes an extra 2 points of damage from crushing or bludgeoning attacks until all Dex damage is healed; cure 1 save. The save DC is Constitution-based.