Crawling claw

A Crawling claw was made from the hands of some 300 small- and medium-sized humanoids. This construct acted like a swarm of insects, but perhaps with even less intelligence. Nevertheless, it was quite disturbing when viewed first hand.

Description
Using their fingers as legs, the hands crawled toward whatever they sensed as a target and swarmed over it. They could also leap 6 ft (1.8 m) vertically. The swarm had no discernible front, back or central body.

Behavior
A crawling claw had only enough intelligence to perform simple guard duty or similar tasks.

Combat
As a sightless and nearly mindless construct, the crawling claw had some distinct advantages in combat. It was unaffected by illusions, gaze attacks and other sight-related attacks. It was immune to disease, poison, stun, sleep, paralysis, death effects, necromancy effects, energy drain, ability drain, fatigue, exhaustion, and mind-based effects such as phantasms, patterns, charm, compulsion, and morale effects. It could not be effectively harmed by spells that targeted one creature or a limited few creatures. It could not be turned, flanked, subdued, tripped, grappled, bull rushed, or critically hit, and took only half damage from piercing and slashing weapons.

The swarm attacked a single opponent at a time, using sheer numbers to overwhelm a target. When first encountered up close, any living creature susceptible to being damaged by the crawling claw was possibly nauseated to the point of distraction, unable to take action or cast a spell. If the victim was prone, the crawling claw did double damage.

The crawling claw was particularly vulnerable to area-effect and grenade-like attacks.