Demobat

Tiny Fiend (Demon), Chaotic Evil

AC: 13

Initiative: +3 (13)

HP: 21 (6d4 + 6)

Speed: 10 ft., fly 40 ft.

STR
4 (-3)
DEX
16 (+3)
CON
12 (+1)
INT
2 (-4)
WIS
10 (+0)
CHA
6 (-2)

Resistances: cold; lightning

Immunities: poison

Condition Immunities: poisoned

Senses: Blindsight 60 ft., Passive Perception 10

CR: 1/2 (XP 100; PB +2)

Actions

Bite.

Melee Attack Roll: +5 (with Advantage if the target is Grappled by a Demobat), reach 5 ft. Hit: 10 (2d6 + 3) Piercing damage.

Tentacles.

Melee Attack Roll: +5, reach 5 ft. Hit: 7 (1d8 + 3) Slashing damage. If the target is a Medium or smaller creature, the target has the Grappled condition (escape DC 13) from all four tentacles.

Find this creature in the encounter builder

Demobat

Source: Stranger Things: Welcome to the Hellfire Club - Licenses and attribution