Black Shuck 2014

CR 11 fiend

Large fiend, chaotic evil

STR19 (+4)

DEX16 (+3)

CON21 (+5)

INT14 (+2)

WIS17 (+3)

CHA15 (+2)

Saving Throws: Strength +8, Dexterity +7, Constitution +9, Wisdom +7
Skills: Perception +3
Resistances: cold, fire, lightning
Damage Immunities: necrotic, poison; bludgeoning, piercing or slashing from nonmagical attacks not made with silvered weapons
Condition Immunities: charmed, frightened
Senses: darkvision 90 ft., truesight 60 ft., passive Perception 13
Languages: understands Abyssal and Common but can't speak
Challenge: 11 (7,200 XP) · Proficiency Bonus +4

Blood Frenzy.

Has advantage on attack rolls vs. any creature that doesn’t have all its hp.

Keen Hearing and Smell.

Has advantage on Wis (Perception) checks that rely on hearing or smell.

Water Walker.

Can move across the surface of water as if it were harmless solid ground. This otherwise works like the water walk spell.

Bonus Actions

Mist Stalker.

In dim light fog or mist it takes the Hide action.

Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details