Sylph Rapier

A Sylph Rapier is a Light Blade found in Golden Sun: The Lost Age and Golden Sun: Dark Dawn. In The Lost Age, it can be attained by giving a Sylph Feather to Sunshine; it is one of five items that may result randomly from the forging job. In Dark Dawn, it is found in a treasure chest on Talon Peak. It can be bought for 10100 coins and sold for 7575. Being a light blade, it can be equipped by Isaac, Felix, Garet, Jenna, Ivan, Piers in The Lost Age. In Dark Dawn, Matthew, Tyrell, Eoleo, Amiti, Karis, and Himi are all capable of equipping the Sylph Rapier.

In The Lost Age
The Sylph Rapier increases the wielder's attack by 124, and its normal attack always counts as an elemental physical attack, one where the damage from the attack is either increased or decreased based on how the user's Jupiter power compares to the target's Jupiter resistance (it is the only pure-element Jupiter-based weapon native to the second game, incidentally, with the Elven Rapier in Golden Sun being the other). Its Unleashed power is Mad Zephyr (Angry Zephyr in Japan), which adds 40 damage points to the resulting damage, is affected by the Jupiter element, and then has a chance to deal double damage after the attack bonus is applied. It has the standard base unleashing rate of 35%. Mad Zephyr appears as the wielder sending a series of four needles of light violet energy blasting into the target. If double damage is inflicted, far more needles are shot at a much higher rate of fire.

Like the Swift Sword in the first game, though to a lesser degree, the Sylph Rapier is a notable weapon due to having a massive damage spike. Though slightly inferior in raw attack and in unleash damage added to the Dracomace Jenna might be using at this point in the game, Mad Zephyr does far more damage than even Felix or Piers can do if its double-damage ability activates. As such, it is worth considering forging the weapon for Jenna's use during the late Eastern Sea and early Western Sea, particularly if she is made an Enchanter, Ascetic, or Ninja to boost her Jupiter power.

In Dark Dawn
In Dark Dawn, the Sylph Rapier retains its status as a pure-elemental weapon, but is not the only Jupiter-based weapon available. The Sylph Rapier gains two new unleashes. Critical Move is a non-elemental attack that multiplies damage by 1.4. The second unleash, Double Attack, does Jupiter-based damage with a multiplier of 1.6. However, Mad Zephyr remains the Sylph Rapier's signature unleash and retains the same mechanics as in The Lost Age.

Being a Jupiter Adept, Karis can easily make use of the Sylph Rapier. It does share some competition with the Yew Bow at that point of the game. The Yew Bow's attack increase is 4 points less than the Sylph Rapier, but has two Jupiter based unleashes with high damage multipliers. Thus, a player may to let another Adept equip the Rapier, which is available to more Adepts, and allow Karis to retain the Yew Bow, which can only be equipped by her and Amiti.

Cultural References
A Sylph is an invisible being of the air, or an air elemental, invented by the medieval alchemist Paracelsus.