Swarm of Beetles

Source: Monster Manual p. 338. Available in the SRD

The Nature of Swarms

The swarms presented here aren’t ordinary or benign assemblies of little creatures. They form as a result of some sinister or unwholesome influence. A vampire can summon swarms of bats and rats from the darkest corners of the night, while the very presence of a mummy lord can cause scarab beetles to boil up from the sand-filled depths of its tomb. A hag might have the power to turn swarms of ravens against her enemies, while a yuan-ti abomination might have swarms of poisonous snakes slithering in its wake. Even druids can’t charm these swarms, and their aggressiveness is borderline unnatural.

"name": "Swarm of Beetles"
"size": "Medium"
"type": "beast"
"alignment": "Unaligned"
"ac": !!int "12"
"ac_class": "natural armor"
"hp": !!int "22"
"hit_dice": "5d8"
"modifier": !!int "1"
"stats":
  - !!int "3"
  - !!int "13"
  - !!int "10"
  - !!int "1"
  - !!int "7"
  - !!int "1"
"speed": "20 ft., burrow 5 ft., climb 20 ft."
"damage_resistances": "bludgeoning, piercing, slashing"
"condition_immunities": "charmed, frightened, grappled, paralyzed, petrified, prone,\
  \ restrained, stunned"
"senses": "blindsight 10 ft., passive Perception 8"
"languages": ""
"cr": "1/2"
"traits":
  - "desc": "The swarm can occupy another creature's space and vice versa, and the\
      \ swarm can move through any opening large enough for a Tiny insect. The swarm\
      \ can't regain hit points or gain temporary hit points."
    "name": "Swarm"
"actions":
  - "desc": "*Melee Weapon Attack:* +3 to hit, reach 0 ft., one target in the swarm's\
      \ space. *Hit:* 10 (4d4) piercing damage, or 5 (2d4) piercing damage if the\
      \ swarm has half of its hit points or fewer."
    "name": "Bites"
"source":
  - "MM"
"image": "/3-Mechanics/CLI/bestiary/beast/token/swarm-of-beetles.webp"

Environment

underdark, grassland, forest, swamp, hill, urban, desert