While in Mideel, before it is destroyed, go to the weapons shop and check the door in the back (the one that does not open.) Then, go to the shop on the hill with the man on the balcony. Walk behind him along the part of the balcony on the side of the shop until you here a rattling sound. Check the spot and you will get a key. Use the key on the door and it will break off. The owner will ask what happened. Tell the truth and he will give you the curse ring. If you lie, he will not give it to you. The Curse Ring raises all of your stats but puts the character on death sentence, which can be countered with a Phoenix Down.