Aqua Goblin

Amphibious. The Aqua Goblin can breathe air and water.

Pack Tactics. The Aqua Goblin has advantage on an attack roll against a creature if at least one of the Aqua Goblin’s allies is within 5 feet of the creature and the ally isn't incapacitated.

Slippery. The Aqua Goblin has advantage on ability checks and saving throws made to escape a grapple.

Spear. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d6 + 1) piercing damage, or 5 (1d8 + 1) piercing damage if used with two hands to make a melee attack.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 1) piercing damage, and the target must succeed in a DC 12 Strength Saving throw or be grappled.

Net. Ranged Weapon Attack: +4 to hit, range 5/15 ft., one Large or smaller creature. Hit: The target is restrained. A creature can use its action to make a DC 10 Strength check to free itself or another creature in a net, ending the effect on a success. Dealing 5 slashing damage to the net (AC 10) frees the target without harming it and destroys the net.