Traits

Swarm: Here the swarm could occupy another creature’s space and vice versa, of course the swarm could move via any type of opening large enough for the tiny insect. In any case, the swarm will not be able to regain its Hit points or gain Temporary Hit points.

Actions

Bites: By using this bite action this swarm of centipedes monster can make the melee weapon attack: +3 to hit, reach 0 ft., however one target in a swarm’s space. Hit: 10 (4d4) or 5 (2d4) perforating damage if the Hit Points of the swarm are less than 50%.

A swarm of centipedes has reduced a creature to 0 Hit point. It is now stable, but poisoned for an hour. Also, it can be Paralyzed if poisoned this way.

Attributes of Swarm of Centipedes, DnD 5E Monster

AC 12 (Natural Armor).
Alignment Unaligned
CHA 1
CON 10
Challenge Rating 1/2
Immunities to certain conditions Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned
DEX 13
HP 22 (5d8)
INT 1
Passive Perception 8
Resistances Bludgeoning and Piercing. Slashing
Roll 0 Full 1d20 +3 4d4
Roll 1 Half of 1d20 + 3 2d4
STR 3
Senses Blindsight 10 Ft.
Size Medium
Speed 20 ft., climb up 20 ft.
Type Small animals in a swarm
WIS 7