Kikuichimonji

The Kikuichimonji is a Light Blade found in Golden Sun. It is dropped by Fenrirs in Venus Lighthouse, although the odds of receiving one are very slim. Being a Light Blade, it can be equipped by Isaac, Felix, Garet, Jenna, Ivan, and Piers. It increases the wielder’s attack by 128, making it both the most powerful Light Blade and second most powerful weapon in Golden Sun. It can be bought for 13400 coins and sold for 10050 coins.

The Kikuichimonji's Unleash effect is Asura. It converts all damage to Jupiter damage and attacks with an additional 64 attack points. It also has a chance of ignoring 50% of the target's defense, increasing the amount of damage done.

The Kikuichimonji is a rare but powerful weapon with few rivals to speak of, outdone only by the Gaia Blade in terms of attack power. However, there are other weapons that can challenge its position, most notably the Swift Sword. Although physically weaker, the Swift Sword's Unleash, Sonic Smash, occasionally triples the damage done, which can overpower even the Gaia Blade. Sonic Smash also does Jupiter damage, and the Swift Sword increases the wielder’s Jupiter power, making it the perfect weapon for Ivan. Similar attributes make the Gaia Blade suitable for Isaac, meaning only Garet is likely to possess a Kikuichimonji in the game's finale. However, all these weapons are found late in Golden Sun and can easily be outdone in Golden Sun: The Lost Age, so their usefulness is somewhat limited.