monsters swarm cr-5-10 Tome of Beasts 2023

Bone Swarm

Large Swarm, CR 10. From Tome of Beasts 2023.

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Bone Swarm

Large Swarm, Chaotic Evil

Armor Class 17 (natural armor)

Hit Points 198 (36d10)

Speed 60 ft., fly 20 ft.

STR
22 (+6)
DEX
18 (+4)
CON
10 (+0)
INT
9 (-1)
WIS
15 (+2)
CHA
20 (+5)

Saving Throws Dex +8, Wis +6, Cha +9

Skills Acrobatics +8, Perception +6, Stealth +8

Damage Immunities poison

Condition Immunities charmed, exhaustion, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained, stunned

Senses darkvision 60 ft., passive Perception 16

Languages Common, Void Speech

Challenge 10 (5,900 XP)

Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny human skull. The swarm can't regain hp or gain temporary hp.
Undead Nature. The bone swarm doesn't require air, food, drink, or sleep.

Actions

Multiattack. The bone swarm makes two Swirling Bones attacks. It can replace one Swirling Bones attack with one Death's Embrace attack, if available.
Swirling Bones. Melee Weapon Attack: +10 to hit, reach 0 ft., one creature in the swarm's space. Hit: 36 (8d8) bludgeoning, piercing, or slashing damage (the bone swarm's choice), or 18 (4d8) bludgeoning, piercing, or slashing damage (the bone swarm's choice) if the swarm has half of its hp or fewer.
Death's Embrace (Recharge 5-6). Melee Weapon Attack: +10 to hit, reach 0 ft., one creature in the swarm's space. Hit: The target is grappled (escape DC 16) if it is a Large or smaller creature. Until this grapple ends, the creature is restrained and any attack against the bone swarm has a 50 percent chance of hitting the grappled creature instead. The bone swarm can have only one creature grappled at a time. The grappled creature has advantage on ability checks made to escape the grapple when the bone swarm has half of its hp or fewer.

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