Sources
CR
Type
Size
Alignment
Movement

Swarm of Campestris

Medium swarm of Tiny Plants, Unaligned

Armor Class 12 (natural armor)
Hit Points 27 (6d8)
Speed 5 ft.
STR
3
-4
DEX
7
-2
CON
10
+0
INT
4
-3
WIS
10
+0
CHA
8
-1
Skills Perception +4
Damage Resistances bludgeoning, piercing, slashing
Condition Immunities Charmed, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned
Senses tremorsense 30 ft., passive Perception 14
Languages understands Common but speaks only through the use of its Mimicry trait
Challenge 1 (200 XP)

Traits

Mimicry. Each campestri in the swarm can mimic any voice or song it has heard, albeit in a nasal falsetto.

Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough to accommodate an individual campestri. The swarm can't regain hit points or gain temporary hit points.

Actions

Head Butts. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit:10 (4d4) bludgeoning damage, or 5 (2d4) bludgeoning damage if the swarm has half its hit points or fewer.

Spores (1/Day). A 20-foot radius of spores extends from the swarm. These spores can go around corners, and they have no effect on Constructs, Elementals, Plants, or Undead. Each other creature in the area must make a DC 10 Wisdom saving throw. On a failed save, the creature is incapacitated and its speed is halved, both for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Lore

Campestris are happy-go-lucky mushroom-like creatures with few cares or worries. They are captivated by music, though they can't distinguish a well-played performance from a bad one. If anyone plays an instrument or sings in the campestris' vicinity, the little creatures will happily sing along, each in an obnoxiously nasal falsetto, as they dance and caper around whoever is making the music.