Bloodseeker

Keen Smell. The Bloodseeker has advantage on Wisdom (Perception) checks that rely on smell.

Bloodseeker vision.  The Bloodseeker Automatically fails checks that require sight but has advantage on any checks made to find something that is bleeding or has blood on it.

Blood Frenzy.  The Bloodseeker has advantage on melee Attack rolls against any creature that doesn't have all its Hit Points.

Maul. Melee Weapon Attack: +4 to hit, reach 5ft, one target. Hit: 7 (1d8 + 1) piercing damage. 

Horrifying Shriek. When the Bloodseeker senses blood, it lets out a screech that alerts other Bloodseekers within 120 ft of it to the same source of blood. Other creatures who hear this within 120 ft of the Bloodseeker must succeed a DC 10 wisdom saving throw or become frightened

Predators Leap. After this creature moves at least 10ft, this creature can leap 15ft more towards a creature. The Bloodseeker then makes one attack against the target and the creature must make a DC 13 athletics check or be knocked prone