Aithranür's Gift

The target is imbued with a bizarre anti-curse: every attack dealt to them heals them an amount equal to the normal damaging power of the attack, but every time they are healed, they take necrotic damage equal to the normal healing power of the effect. Not only that, but all attacks the target performs will heal the target, and every healing effect they cause will deal necrotic damage. During these thirty days, will Aithranür's power prove a blessing or a curse?