Black Ops Swarm of Vermin

All stats configured without PB or modifications.
AC: 9 plus PB
Hit Points: 9 + 5 x your ranger level
Saving Throws: Dex +4 plus PB, Con +1 plus PB, WIS +3 plus PB
Skills: Acrobatics +4 plus PB, Investigation +3 plus PB, Perception +3 plus PB, Stealth +4 plus PB
Senses: Passive perception 10 plus PB

Recon Training. The swarm has advantage on Wisdom (Perception) checks.

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 beast.

Multiattack. The swarm can make two bite attacks. This increases to 3 when the player hits level 12 or at the DM's discretion.

Bites. Melee Weapon Attack: +your spell attack modifier to hit, reach 0 ft., 1 target in the swarm's space. Hit: 2d6 + 7 piercing damage.