Vengeful Wound

You have sworn a divine oath to exact revenge on another creature, referred here as your "mark". Your mark has grievously wronged you or another person deemed your ally. 

• You have advantage on Perception, Investigation, History, Charisma, and Insight rolls as it relates to your mark. Your DM determines whether advantage applies or not. 
• Any damage you do against your mark is deemed magical for the purposes of overcoming immunity to non-magical damage. This bonus does not apply to creatures other than your mark. 
• Once per long rest, you can activate your Vengeful Wound. As long as your mark is within 1,000 feet of you, you learn: An approximation of their current hit points, their current mental state, and their general direction from you. This effect lasts for 1 minute. When you do so, you take 1d6 slashing damage as your wound pulses with pain.

Once your mark is killed or otherwise destroyed, your Vengeful Wound fades, and this feat is removed.