Name: Tarbh Uisge
Huge monstrosity, chaotic evil
Armor Class: 18 (natural armor)
Hit Points: 200 (16d12 + 96)
Speed: 40 ft., swim 60 ft.

STR 27 (+8)
DEX 10 (+0)
CON 22 (+6)
INT 4 (-3)
WIS 10 (+0)
CHA 6 (-2)

Skills: Athletics +14, Perception +6
Senses: darkvision 60 ft., passive Perception 16
Languages: understands Giant but can't speak
Challenge: 14 (11,500 XP)

        Charge. If the Tarbh Uisge moves at least 20 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 18 (4d8) piercing damage.
        Hold Breath. The Tarbh Uisge can hold its breath for up to 30 minutes.

Actions
        Multiattack. The Tarbh Uisge makes two attacks: one with its horns and one with its hooves.
        Horns. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 25 (4d8 + 8) piercing damage.
        Hooves. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 20 (4d6 + 8) bludgeoning damage.
        Bellow. The Tarbh Uisge lets out a terrifying bellow that can be heard up to a mile away. All creatures within 60 feet of the Tarbh Uisge that can hear it must make a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the Tarbh Uisge's Bellow for the next 24 hours.

Legendary Actions
        The Tarbh Uisge can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The Tarbh Uisge regains spent legendary actions at the start of its turn.
        Gore. The Tarbh Uisge makes a horns attack.
        Splash. The Tarbh Uisge creates a powerful splash with its hooves, spraying water in a 30-foot cone. Each creature in the area must make a DC 18 Dexterity saving throw, taking 22 (4d10) bludgeoning damage on a failed save, or half as much damage on a successful one.
        Swim. The Tarbh Uisge moves up to its swim speed without provoking opportunity attacks.

Description: The Tarbh Uisge is a fearsome creature from Scottish folklore, known for its deadly and vicious nature. It is often described as a water bull or water ox, with a powerful and muscular body that is covered in thick, shaggy fur.

This creature is said to be incredibly large and strong, with massive horns on its head that can gore anything in its path. Its eyes are said to glow with an eerie red light, and its breath is said to be hot and foul-smelling.

The Tarbh Uisge is said to dwell in deep pools or rivers, where it waits for unsuspecting prey to come near the water's edge. It is said to be able to breathe underwater, and can swim with incredible speed and agility.

Those who encounter the Tarbh Uisge are said to be in great danger, as it is known to be a fierce and relentless hunter. Legend has it that the only way to escape the Tarbh Uisge's wrath is to offer it a tribute of some kind, such as a valuable object or a sacrifice of livestock.

Overall, the Tarbh Uisge is a formidable creature from Scottish folklore, feared for its immense strength and deadly nature.