Medium Humanoid, any alignment
Armor Class 14 (natural armor)
Hit Points 27 (5d8+5)
Speed fly +30, swim +30, walk +20
Challenge 1/2
Skills perception +1
Senses passive Perception 11
Languages Aquan, Common
Hold Breath. Can hold its breath for 15 min.
Beak. Melee Weapon Attack: +5 to hit, 5 ft., one creature,. 5 (1d4+3) piercing damage.
Javelin. Melee or Ranged Weapon Attack: +5 to hit 5 ft. or range 30/120' one creature. 6 (1d6+3) piercing damage.
Tempest Breath (Recharges: Short/Long Rest). Exhales lungful of air in 15 ft. cone. Each creature in that area pushed up to 15 ft. away from gullkin (DC 12 Str negates).
Source: Tome of Beasts 3 · OGL/Open