Azure Foxhound

Keen Hearing and Smell. The Foxhound has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The Foxhound has advantage on attack rolls against a creature if at least one of the monster's allies is within 5 feet of the creature and the ally isn't incapacitated.

Keen Hearing. The Foxhound has advantage on Wisdom (Perception) checks that rely on hearing

Blood Frenzy. The creature has advantage on melee attack rolls against any creature that doesn't have all its hit points.

Blue Flame Bite. Melee Weapon Attack: The creature's mouth lights on fire and bites at the target. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage and an additional 1d4 fire damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.