Swarm of Beetles 2014
CR 1/2 beast
Medium beast, unaligned
STR3 (-4)
DEX13 (+1)
CON10 (+0)
INT1 (-5)
WIS7 (-2)
CHA1 (-5)
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 insect. The swarm can't regain hit points or gain temporary hit points.
Actions
Bites.
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.
Environments: Caves, Desert, Underworld
Source: System Reference Document 5.1 (Wizards of the Coast) · License: Creative Commons Attribution 4.0 / OPEN GAME LICENSE Version 1.0a details