This item seems like a small square stone with an arcane symbol etched into it. Once attuned the stone disappears and you gain a tattoo or mark of the symbol somewhere on your skin (you choose the placement on attunement). This mark flares with a magical colour (your choice) when you enter combat.

The mark cannot be removed by non-magical means while you are attuned to it even if the mark's area on your flesh is damaged. The mark is truthfully on your very soul not actually your skin. The mark is removed, returning to its stone form, if you willingly unattune to it or if you die. Willing, in this case, means of your own free will without effect of any mind controlling spells.

While attuned you gain a +1 bonus to the attack rolls and the damage rolls you make with unarmed strikes and natural weapons. Such attacks are considered to be magical.

Notes: Bonus: Unarmed Attacks, Damage: Unarmed Attacks, Damage, Buff, Combat