Armor Class 14
Hit Points 11 (2d8 + 2)
Speed 30 ft., swim 30 ft.
Skills Perception +2
Senses blindsight 10 ft., passive Perception 12
Languages —
Challenge 1/2
Two Heads. The amphisbaena has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious.
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.
GoS, p. 230