Bog-Lurker Goblin

•  Amphibious Hold. The goblin can hold its breath for up to 15 minutes.

• Swamp Camouflage. The goblin has Advantage on Dexterity (Stealth) checks made to hide in murky water, mud, reeds, and mangrove roots. While submerged with only its periscope-like eyes and nostrils showing, it has Three-Quarters Cover (+5 to AC and Dex saving throws).

• Basilisk Skitter (Water Dash). The goblin has wide, fringed toes that allow it to run across the surface of still or slow-moving water, mud flats, and quicksand as if it were normal ground, provided it ends its turn on solid ground or submerged. If it doesn't, it sinks into the water at the end of its turn.

• Mud-Slick Shell. The goblin has Advantage on ability checks and saving throws made to escape or avoid being Grappled or Restrained.

•  Snapping Beak-Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage, and the target is Grappled (escape DC 10). Until this grapple ends, the goblin cannot bite another target.

• Gator-Tooth Harpoon. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage plus 2 (1d4) poison damage. If thrown underwater or into marsh water, it suffers no disadvantage due to water resistance.

• Reed Blowpipe (Bog Rot Dart). Ranged Weapon Attack: +4 to hit, range 25/100 ft., one target. Hit: 1 piercing damage plus 3 (1d6) necrotic or poison damage from swamp filth.

• Death Roll. Melee Attack: +4 to hit, range grappled target, one target. Hit: Grappled creature takes 4 (1d8) slashing damage and is pulled Prone into the water or mud. 

Mire Skitter. The goblin takes the Disengage or Hide action. If it is in water or muddy terrain, its swimming speed increases by 10 feet until the end of the turn.

Death Roll Snip. When a creature grappled by the goblin’s Snapping Beak-Bite attempts to escape and fails, the goblin violently twists its body. The grappled creature takes 4 (1d8) slashing damage and is pulled Prone into the water or mud.