Swarm of Quippers

Medium swarm of Tiny beasts, unaligned

Armor Class 13
Hit Points 28 (8d8 − 8)
Speed 0 ft., swim 40 ft.

STR	DEX	CON	INT	WIS	CHA
13 (+1)	16 (+3)	9 (−1)	1 (−5)	7 (−2)	2 (−4)

Damage Resistances bludgeoning, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses darkvision 60 ft., passive Perception 8
Languages --
Challenge 1 (200 XP)

Blood Frenzy. The swarm has advantage on melee attack rolls against any creature that doesn't have all its hit points.
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 quipper. The swarm can't regain hit points or gain temporary hit points.
Water Breathing. The swarm can breathe only underwater.

Actions

Bite. Melee Weapon Attack: +5 to hit, reach 0 ft., one creature in the swarm's space. Hit: 14 (4d6) piercing damage, or 7 (2d6) piercing damage if the swarm has half of its hit points or fewer.