Holocron

Shyrack Swarm

Large swarm of Small beasts · CR 1
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Shyrack Swarm
A churning cloud of cave flyers that fills a creature's space and shreds it with countless biting teeth.
Minion
How to run itMove into a PC's space and bite for 2d8; keep it engulfing one target and accept the halved damage once it drops below half hit points.

Armor Class 12 · Hit Points 38 (6d10+10) · Speed 0 ft., fly 20ft

STR DEX CON INT WIS CHA
6 18 11 3 12 4

Keen Hearing (Trait). The Shyrack has advantage on Wisdom (Perception) checks that rely on hearing.

Swarm (Trait). The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a small shyrack. The swarm can't regain hit points or gain temporary hit points.

Bite (Action). Melee Weapon Attack: +6 to hit, reach 5 ft., one creature in the swarm's space. Hit: 9 (2d8) kinetic damage, or 4 (1d8) kinetic damage if the swarm has half of its hit points or fewer.