Ixion Mail

The Ixion Mail is an Armor-class piece of armor found in Golden Sun: The Lost Age. It is found in a treasure chest in the Alhafran Cave, in an area that can be reached by casting Lash on a nearby rope to come up to a ledge with three chests. As an Armor-class item, it is equippable by the warrior-style Adepts Felix, Piers, Isaac, and Garet, Its buy value is 1300 coins and its sell value is 975.

The Ixion Mail increases base Defense by 26. In addition, it increases the equipped Adept's Jupiter Resistance and Mercury Resistance by 20 each.

As this can be found just after the boss battle with Briggs, it is a valuable find at that point in time. If Felix is already equipped with a Psynergy Armor, however, the Ixion Mail probably isn't as valuable for him to wear as Psynergy Armor, which provides a very useful PP boost. However, keep it in your inventory nonetheless, because later in the game, when Piers first joins your party at the Gabomba Statue, this will be an automatic improvement over the Chain Mail he will be wearing. If you plan on buying Plate Mails as soon as you gain access to the Great Eastern Sea, though, this probably won't remain equipped on your party for very long.