The Crown of Penance - A crown of thorns worn by a martyr, imbued with a suffering spirit, that grants eternal life to the wearer. While this is all true, the crown is cursed and unremovable. Over the first week of wear, the thorns dig into the scalp of the wearer and gradually inflict damage. After the first week, they are fully under the skin, and, absorbing and becoming engorged with blood, rapidly rake up and down the inside of the character's flesh, tearing through muscle, tissue, organs, and bones for the rest of the character's unnaturally long life. Every second the character lives, they take 1 damage. When the count drops to zero, the character passes out and sleeps in torpor for a year. When the character awakens, they are at full health, and the damage starts again. Repeat ad infinitum.
Mirror of Answers - A glance into this mirror will reveal the user's reflection, miming out the solution to a dilemma the character faces. Unbeknownst to the character, each answer costs a tenth of their soul. Once the mirror collects their full soul, the character is imprisoned in the mirror, and the spirit of the mirror takes possession of the character's body and flesh.