Brimorak

Boiling Blood. A creature that hits the brimorak with a melee weapon while within 5 feet of it takes 4 (1d8) fire damage.

Flaming Weapon. The brimorak's hoofs and any weapon it wields is wreathed in demonic flame, adding an additional 1d6 fire damage (included in the attack).

Water Susceptibility. For every 5 feet the brimorak moves in water, or for every gallon of water splashed on it, it takes 1 cold damage. If it is full submerged in water at the start of its turn it takes 10 cold damage. This damage bypasses the brimorak's resistances and immunities.

Multiattack. The brimorak makes two melee attacks. It can replace one of these attacks with Burning Spittle if it is available.

Flaming Sword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage plus 3 (1d6) fire damage.

Hoof. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage plus 3 (1d6) fire damage.

Burning Spittle (Recharge 5-6). The brimorak spits a globule of boiling blood to a point it can see within 30 feet of itself, which sprays in a 5-foot-radius sphere centered on that point. Any creature within the sphere must succeed a Dexterity 14 saving throw or take 18 (4d8) fire damage on a failed save, or half as much damage on a successful one.

Spellcasting. The brimorak casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 13):
At will: produce flame

1/day each: dimension door, dispel magic, fireball

Fume (Recharge 5-6). The brimorak emits a cloud of dark smoke that covers a 10-foot-radius sphere centered on itself. The area inside the sphere is considered heavily obscured and it persists until the start of the brimorak's next turn.