Excalibur

An Excalibur is a Long Sword-class weapon found in Golden Sun: The Lost Age and one of the most powerful weapons of all. It is acquired by giving an Orihalcon to Sunshine the Blacksmith in Yallam, where he will randomly forge it into either that or four other items. However, due to the nature of Golden Sun's RNG, if you leave the Orihalcon with Sunshine, then talk to the Sanctum's priest and return for your item, you should get the Excalibur every time. The Excalibur is bought for 29200 coins while its resale value is 21900 coins. Visually, the Excalibur resembles a great grey, sparkling sword with a gold hilt that has a red gemstone set into it.

The Excalibur carries a non-elemental attack rating of 180. This sword has the Unleash effect Legend, which activates at a rate of 35% (which is standard) and converts the attack into a Jupiter-elemental attack with 73 extra attack points added, and the effect has a chance of literally tripling the damage done. Legend visually resembles a 3D hologram of a symbol form above the enemy party, and the symbol generates either one holographic sword that drives itself into the target or three holographic swords that drive themselves into the target in succession.

The Excalibur, as a Long Sword-class item, can be wielded by Isaac, Garet, Felix, and Piers. The Excalibur is one of the game's best weapons, competing with the Sol Blade for the sheer power of their unleashes. The Sol Blade has 200 attack and its unleash converts the attack into a Venus-elemental attack and automatically triples the damage, while the Excalibur has 180 attack and its unleash converts the attack into a Jupiter-elemental attack, adds a lot of additional attack points, and then has a chance to triple the damage. In addition, the Sol Blade's general power is compounded by the fact that Isaac and Felix have a naturally high Venus power rating, while there are no Jupiter Adepts that can equip the Excalibur. These amount to a weapon that runs marginally behind the Sol Blade as an ultimate weapon. But it is still an amazing enough weapon that multiple Excaliburs should be given to party members that can wield it, and on good days Excalibur's Legend does even more damage than Sol Blade's Megiddo. It is also one of the best offensive measures to use against the Doom Dragon.

Cultural Allusions
Excalibur is the sword of the mythical King Arthur. Due to it's fame, it appears in several other games, including the MMORPG Runescape.