Rot Grub Swarm

Huge swarm of Tiny beasts, unaligned

Armor Class 9
Hit Points 94 (9d12 + 36)
Speed 20 ft., climb 20 ft.

STR	DEX	CON	INT	WIS	CHA
8 (-1)	15 (+2)	18 (+4)	1 (-5)	4 (-3)	1 (-5)

Damage Resistances necrotic, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses blindsight 30 ft., passive Perception 7
Languages –
Challenge 5 (1,800 XP)

Special Traits

• Spider Climb. The rot grub swarm can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
• Swarm. The swarm can occupy another creature’s space. The swarm can move through any opening wide enough for a Tiny maggot. The swarm cannot regain hit points or have temporary hit points.

Actions

• Bites. Melee Weapon Attack: +5 to hit, reach 0 ft., one creature in the swarm’s space. Hit: The target becomes infested by 1d6+2 rot grubs. At the beginning of the infested creature’s turn, it takes 1d6 piercing damage per rot grub infesting it. Application of fire to the wound before the end of the target’s next turn does 1 fire damage and kills those rot grubs. After this, however, the rot grubs have burrowed too deep into the flesh to be affected in this manner. If a creature infested by rot grubs ends its turns at 0 hit points, it dies as the grubs reach its heart and kill it. Lesser restoration or other effects that cure disease kill all rot grubs infesting the creature.
• Engulf. The swarm engulfs a Medium or smaller creature. The engulfed target is considered grappled by the swarm (escape DC 10) and becomes blinded, restrained, and unable to breathe. It must succeed on a DC 15 Constitution saving throw at the start of each of the swarm’s turns or take 13 (2d10 + 2) piercing damage and be infested by 1d6+2 rot grubs (see the bites attack, above). If the swarm moves, the engulfed target moves with it. The swarm can have up to two creatures engulfed at one time.

This wriggling mass of horror has been devouring the bones of the dead to be found in this chamber but sensing the arrival of fresh prey the entire nauseating mass of white worms wriggles forth from the puddle to attack.