Baldaghaur
Small fiend (demon), chaotic evil

Armor Class 20 (Plate, Shield)
Hit Points 65 (10d6 + 30)
Speed 5 ft., swim 40 ft.

STR 18(+4) DEX 11(+0) CON 17 (+3) INT 13 (+1) WIS 16 (+3) CHA 13 (+1)

Skills: Acrobatics +3, Athletics +7
Damage Resistances: fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Damage Immunities: cold, poison
Condition Immunities: poisoned
Senses: darkvision 120 ft., passive Perception 13
Languages: Aquan, Abyssal, telepathy 60 ft.

The Baldaghaur are demons that populate the icy seas of Yeenoghu's layer, the Death Dells, piloting large wooden boats across the ocean. They frequent the waters around a sandy isle near the shores of the barren land, on which lies their master, a whale-like demon lord that formerly controlled the Death Dells known as Bechard, Lord of Tempests. A once mighty archfiend, he was bested by Yeenoghu and left to rot on the island, too weakened to do much of anything to try and regain his former layer. It is because of this reason that the Baldaghaur despise the lord of gnolls and all who would follow him, and they are known to lead assaults on any of his war bands that come near the coast, which has gained them Yeenoghu's ire.

The Baldaghaur originated from breeding between demons and aquatic lycanthropes in times past. While this has given them the power of both mighty demons and the aquatic monsters the lycanthropes could assume the form of, it has given them a vulnerability to silver, a trait all lycanthropes, and by extension Baldaghaur, have.