Hecatonchier

Gargantuan swarm of tiny undead, unaligned

a mass of severed hands, the "Helping Hands"

[CR (XP)]
AC 14 | HP __ (__d__) | Speed 30 ft

Damage Immunities: poison

Condition Immunities: charmed, frightened, paralyzed, petrified, poisoned, prone, restrained, stunned

Senses: blindsight 30 ft, tremorsense 90 ft (blind beyond this radius)

Languages --

Turning Resistance.

Actions
Multiattack. The Helping Hands make 4 melee attacks (3 at 3/4 health, 2 at 1/2 health, 1 at 1/4 health).

Punch. Melee weapon attack: +6 to hit, reach 5 ft, one target. On hit: 1d6 bludgeoning damage.

Scratch. Melee weapon attack: +6 to hit, reach 5 ft, one target. On hit: 1d6 slashing damage.

Grab. Melee weapon attack: +6 to hit, reach 5 ft, one creature. On hit: 1d6 piercing damage plus one hand attaches to the target. The swarm loses 1 HP, and the detached hand has 1 HP. Up to 10 live hands can be detached at a time in this manner. At the end of the helping hands' turn, the detached hands each do 1d4 piercing damage to their target. Any creature, including the one the hands are attached to, can use an action to remove one hand.