Gaia Blade

The Gaia Blade (Gaia no Tsurugi/Sword of Gaia in Japan) is a Long Sword weapon found in Venus Lighthouse at the very end of Golden Sun. The Gaia Blade increases the wielder's Attack by 135 and converts all normal attacks to Venus-element attacks, as well as boosting the wielder's Venus power and resistance by 20 each. It is the strongest weapon available in the first game. Its purchase value is 17000 coins, and its sell value is 12750 coins.

The Gaia Blade is capable of unleashing the Titan Blade effect (Titanic in Japan), which resembles a colossal sword crashing down on the target, digging into them, and detonating. It is essentially comprised of the weapon's standard Venus-based attack with an additional 70 attack points behind it, and as a result of the sword's increase to the power of Venus attacks, it can be extremely deadly in the hands of Isaac. Standard methods of maximizing its power is to give Isaac only Venus Djinn and make him of the Lord class, as well as equip him with the Warrior's Helm, which increases Venus power by 10 and boosts Critical Hit rate by 10%, and Hyper Boots as well, which increases critical hit rate even further by 12% (amounting to Isaac unleashing Titan Blade with a 57% success rate).

As a Long Sword, Isaac, Felix, Garet, and Piers are capable of using it; however, due to his high Agility, Attack, and Venus power, Isaac is usually considered its best choice of wielder in the first. If transfered to The Lost Age, the sword is actually outpowered by the other equipment Felix's party has most likely amassed (Hestia Blade, Phaeton's Blade, etc.) when Isaac's party joins. Still, if given to a Lord or Slayer along with the Warrior's Helm, the Erinyes Tunic, an Aegis Shield and Hyper boots to boost it's unleash rate, it will be on par with weapons that offer a much higher base attack bonus due to it's exceptionally powerful Venus unleash, and its Venus power bonus will still apply to Psynergy used, until Isaac is equipped with a far more "ultimate" weapon like Excalibur or the Venus-based Tisiphone Edge and Sol Blade.