Blood Hunger

You can tap into your vampiric nature to heighten your senses and power, but at a cost. Once per long rest, as a bonus action, you can gain advantage on Strength, Dexterity-based ability checks, saving throws and attack rolls for 30 seconds. After using this ability, you must succeed on a Wisdom saving throw (DC = 10 + your proficiency bonus) or suffer from intense bloodlust.

While blood lusted, you have disadvantage on Wisdom (Insight), Intelligence (Investigation) and attack rolls for the next hour until you feed on blood.