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 Mercury 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%.

Analysis
Some of the Orihalcon-forged equipment is the best in The Lost Age; the Excalibur is the second best weapon in the game following the Sol Blade because it can randomly exceed even the Sol Blade's Unleash damage, and since multiple Excaliburs can be forged you can have three Excaliburs equipped onto your other three warrior Adepts. The Cosmos Shield is the best hand-armor oriented toward defense. Big Bang Gloves can be specifically useful to an Adept that attacks with Mars-aligned offenses. The Nebula Wand is as good a weapon for an Adept like Mia as you're going to get. The Millenium Helm and Xylion Armor are generally strong defensive items with generally strong statistics buffs. The Stellar Axe is perhaps the least desirable, being far inferior to Excalibur.

=RNG Method= Here is the RNG method for how to get the Orihalcon.

Orihalcon Dropped by Sky Dragons in Anemos Sanctum. Standard rules apply.

Party Order: Felix, Jenna, Sheba, Piers Attack order: Sheba, Felix, Jenna, Piers

Round 1

Felix casts Quake Sphere! Big Arrow: Sky Dragon

Jenna casts Cycle Beam! Big Arrow: Sky Dragon

Sheba casts Shine Plasma! Big Arrow: Other Enemy

Piers casts Glacier! Big Arrow: Other Enemy

Round 2

Felix casts Earthquake! Big Arrow: Sky Dragon

Jenna casts Cycle Beam! Big Arrow: Sky Dragon

Sheba unleashes Whorl! You felled Sky Dragon!

Piers attacks other enemy! You felled other enemy!

You got some Orihalcon.