Tisiphone Edge

A Tisiphone Edge is a Light Blade-class weapon found in Golden Sun: The Lost Age. It is acquired as a rare drop from a Cruel Dragon at Islet Cave. Visually, the Tisiphone Edge resembles a thin, yellow rapier-like sword with a large, red hilt. It is bought for 23000 coins while its resale value is 17250 coins.

The Tisiphone Edge carries a non-elemental attack rating of 178. This blade has the Unleash effect Vengeance, which activates at a rate of 35% (which is standard) and converts the attack into a Venus-elemental attack with 71 extra damage points added, and the effect may either multiply the attack's strength by 1, 2, or 3 (at a rate of 30%, 20% and 50% respectively). When Vengeance multiplies the attack strength by 3, it actually does more damage to an opponent than Megiddo does to the same opponent, because when the attack strength is multiplied by 3, the extra damage points are multiplied as well, thus with the multiplier, Vengeance at x3 multiplier adds 213 extra damage points in addition to tripling the base physical attack. Vengeance resembles a large, horned, Amazon-esque woman who replaces the party and rapidly shoots seven subsequent arrows at the target in just over a second; if the effect multiplies damage by 1, only two of the arrows actually hit the enemy and the rest miss and fly past it; if the damage multiplier is 2, four of the seven arrows hit the enemy; and in the best-case scenario of multiplying damage by 3, all seven arrows strike the enemy.

In Golden Sun: The Lost Age
The Tisiphone Edge, as a Light Blade-class item, can be wielded by Isaac, Garet, Ivan, Felix, Jenna, and Piers. The Tisiphone Edge is arguably one of the game's best weapons, potentially dealing massive damage that rivals the unleash effects of the game's other "ultimate" weapons, the Sol Blade and the Excalibur. It would not be a bad idea to provide multiple Tisiphone Edges to party members wherever they do not have Excaliburs and the Sol Blade available. As a Venus elemental attack, Tisiphone Edge's Vengeance is especially strong on a Venus Adept, so one may want to give it to the Venus Adept that does not have the Sol Blade equipped. It is extremely hard to get from the Cruel Dragons at Islet Cave, however, unless you use the Random Number Generator method provided below.

In Golden Sun: Dark Dawn
In Dark Dawn, the Tisiphone Edge is found even later in the game. Like the previous game, it is a rare drop item from Great Dragon within Crossbone Isle. Fell it with an offensive Mercury Djinni to improve your chances. It gains 3 new unleashes: Vorpal Slash, Combat Dance, and Light Surge. It can be equipped by Matthew, Tyrell, Karis, Himi, Eoleo, and Amiti. Matthew will likely be holding the Sol Blade by now, so with its Venus Power, it is a remarkable choice for Himi.

Cultural allusions
In the Greek mythology, Tisiphone is one of the three Erinyes or Furies, along with Alecto and Megaera (who can be summoned in The Lost Age). Her purpose was to avenge murder by inciting suicidal madness in the guilty. She was once in love with Cithaeron, who apparently committed a mortal crime. Cithaeron implored her to execute him herself, which she did by having him be bitten by one of the poisonous snakes that served as her hair.

RNG Method (Golden Sun: The Lost Age)
The Tisiphone Edge is very hard to acquire, and in order to gain one, you must kill a Cruel dragon, preferably with a Mars Djinn as it quadruples the chance. There are also ways to get a 100% chance of getting the Tisiphone Edge, the most common looking like this:

Once you enter the long hallway, save, and do a hard reset. (Just flick the on/off switch off, and back on again). Run around until you encounter your first monster. If it is a Cruel Dragon, and a Druj, continue. If it isn't, do another hard reset, and try again. The Adept who attacks third MUST attack with an OFFENSIVE Mars Djinni for the following method to work.

TURN 1
 * Sheba: Storm Ray.
 * Felix: Quake Sphere.
 * Jenna: Flare Wall.
 * Piers: Glacier.

*The monsters should not attack this turn as you get the first strike when using a hard reset.

TURN 2
 * Sheba: Storm Ray.
 * Felix: Quake Sphere.
 * Jenna: Unleash your Mars Djinn (preferably Shine) on Cruel Dragon.
 * Piers: Attack the other monster.

This should give you a Tisiphone Edge.

(NOTES:

-If you get a duo of a Cruel Dragon and a Druj, and you reverse this so you unleash the Mars Djinni on the Druj, you will instead get the Berserker Band.

-Psynergies that affect your entire party (Aura and Wish series, High Impact, etc.) can also be used, but group healing Psynergies are the equivalent of two area Psynergies. This can be used to your advantage in certain situations, such as if your Mars Adept does not attack third. For example, if your party is Sheba, Jenna, Felix and Piers (in order of agility), you can have Jenna cast Aura in addition to the other three area Psynergies during turn 1, then on turn 2 continue the battle as normal, having Sheba cast an area Psynergy and Jenna unleash her Mars Djinni.

-If there is a Wonder Bird in the party with the Cruel Dragon, you have to alter the battle plan just slightly to accommodate (the Wonder Bird is the equivalent of half of a multi-area Psynergy). This can be done easily by using a single-target Psynergy, such as Spire or Heat Wave).