Ring used as a charm since ancient times.
Madain's Ring is an Add-on that provides +2 Spirit, +2 Magic Defense, absorbs Ice-elemental damage, and teaches the abilities Body Temp, Guardian Mog, and Chemist. It can be obtained by finding it by using a Dead Pepper at the mountain crack on northeastern part of the Forgotten Continent while on Choco, bought at the Treno Auction House, or synthesized at Linbdlum (discs 3/4), Alexandria (after getting Blue Narciss), Daguerreo, Treno discs 3/4), and the Black Mage Village (discs 3/4). It requires 3,000 gil, a Bone Wrist, and a Stardust Rod to make one Madain's Ring.
Mada'in Saleh is an ancient city located in the north of Saudi Arabia said to have been cursed and destroyed by a cataclysmic earthquake as a punishment by Allah for the Thamudis' idol worship.