Amphisbaena

Medium Monstrosity, Unaligned

AC: 14

Initiative: +4 (14)

HP: 11 (2d8 + 2)

Speed: 30 ft., swim 30 ft.

STR
14 (+2)
DEX
18 (+4)
CON
12 (+1)
INT
3 (-4)
WIS
10 (+0)
CHA
3 (-4)

Skills: Perception +2

Senses: blindsight 10 ft., Passive Perception 12

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

Two Heads.

The amphisbaena has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious.

Actions

Multiattack.

The amphisbaena makes two bite attacks.

Bite.

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d4 + 4) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 3 (1d6) poison damage on a failed save, or half as much damage on a successful one.

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Amphisbaena

Source: Ghosts of Saltmarsh, p. 230 - Licenses and attribution