Orihalcon

Orihalcon (supposed to be Orichalcum, a brass/gold metal associated with Atlantis in Plato) is the most advanced forgeable material in Golden Sun: The Lost Age. It is described as "An ore of great power". It is found in various areas after the Wings of Anemos are acquired, such as in Anemos Sanctum, and it can also be dropped extremely rarely from a Sky Dragon in Anemos Sanctum (fell it with Jupiter Djinn to increase drop rate by four times). Being an Artifact, it can be sold and later repurchased. It can be bought for 4000 coins and sold for 3000 coins. It can be forged into the following equipment, most of which are considered among the game’s best:

Big Bang Gloves: Glove class: Defense +47: Mars power +40. It is bought for 10200 coins and sold for 7650 coins. The chance of it being forged is 15%. Cosmos Shield: Shield class: Defense +49: All elemental resistances +20. It is bought for 12200 coins and sold for 9150 coins. The chance of it being forged is 15%. Excalibur: Long Sword class: Attack +180: Unleashes Legend, which converts to Jupiter damage, adds 73 attack points, and often strikes for 3 times the damage. It is bought for 29200 coins and sold for 21900 coins. The chance of it being forged is 5%. Millenium Helm: Helm class: Defense +48: Maximum HP +20. It is bought for 11400 coins and sold for 8550 coins. The chance of it being forged is 20%. Nebula Wand: Staff class: Attack +165: Unleashes Reverse Star, which converts to Jupiter damage, adds 63 damage points, and addds 10% damage done to the user's own PP meter. It is bought for 15200 coins and sold for 11400 coins. The chance of it being forged is 10%. Stellar Axe: Axe class: Attack +171: Unleashes Supernova, which converts to Jupiter damage, adds 63 attack points, and stuns the target. It is bought for 19700 coins and sold for 14775 coins. The chance of it being forged is 10%. Xylion Armor: Armor class: Defense +50: Attack +12. It is bought for 22500 coins and sold for 16875 coins. The chance of it being forged is 20%.