Swarm of Rot Grubs

AC:8 HP:22 Speed:5', climb 5'
STR:2(-4) DEX:7(-2) CON:10(+0)
INT:1(-5) WIS:2(-4) CHA:1(-5)
Resistances: Piercing, Slashing
Immunities: Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained
Senses: Blindsight 10' Passive Perception: 6
Swarm: stacks spaces and cannot heal/gain HP
{1}{e}Burrow +0, 0' reach, 1 creature. 1d4 grubs
1d6 piercing per grub/turn. Fire before next turn
kills all grub