Huge Beast (Swarm), unaligned
Armor Class 13 (natural)
Hit Points 114 (12d12+36)
Speed swim +40, walk +20
Challenge 5
Skills perception +2
Damage Resistances bludgeoning, cold, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses passive Perception 12
Languages —
Swarm. The swarm can occupy another creature's space and vice-versa and the swarm can move through any opening large enough for a Med penguin. The swarm can't regain hp or gain temp hp.
Tobogganing Tide. The swarm can move at double its walking speed over ice and snow.
Beaks. Melee Weapon Attack: +5 to hit, 0 ft., one creature, in the swarm's space. 21 (6d6) piercing damage or 10 (3d6) if the swarm has half its hp or fewer.
Toboggan Charge (Recharge 5-6). The swarm moves up to 20' in a straight line over ice or snow and can move through the space of any Large or smaller creature. The first time it enters a creature's space during this move that creature must make a DC 14 Str save. On a failure a creature takes 10 (3d6) bludgeoning damage and 10 (3d6) piercing damage and is knocked prone. On a success a creature takes half the damage and isn't knocked prone.
Source: Tome of Beasts 3 · OGL/Open