Hell Hound's Power

You have developed traits similar to those possessed by a hell hound, granting you the following benefits:

• You gain darkvision out to a range of 60 feet.
• You have advantage on Wisdom (Perception) checks that rely on hearing or smell.
• Once per turn, when you hit a creature with a melee attack, you can cause the next melee attack roll made against the creature, before the start of your next turn, to have advantage.
• As an action, you can exhale fire in a 15-foot cone. Each creature in that area must make a Dexterity saving throw (DC 8 + your proficiency bonus + your Constitution modifier), taking 3d6 fire damage on a failed save, or half as much damage on a successful one. This damage increases by 1d6 when you reach 11th level (4d6), and 17th level (5d6). You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.