Aqua Goblin Shaman (Nilbog)

Innate Spellcasting. The shaman's innate spellcasting ability is Charisma (spell save DC 12). It can innately cast the following spells, requiring no material components:

At will: shape water, infestation

1/day: confusion

Nilbogism. Any creature that attempts to damage the shaman must first succeed on a DC 12 Charisma saving throw or be charmed until the end of the creature’s next turn. A creature changed in this way takes no action.

The shaman can’t regain hit points, including through magical healing, except through its Reversal of Fortune reaction.

Pack Tactics. The Aqua Goblin Shaman 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.

Shaman's Spear Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) poison damage.

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.

Shortbow. Ranged Weapon Attack: +4 to hit, range 80/320 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Reversal of Fortune. In response to another creature dealing damage to the nilbog, the nilbog reduces the damage to 0 and regains 1d6 hit points.