A throwing star that fuses two crescent-shaped sickles into one deadly weapon.
Description
The Twin Viper is a weapon for Yuffie in Final Fantasy VII Rebirth. It starts with one materia slot, and teaches Yuffie the Windstorm ability, a 
Wind-based attack that changes depending on if the weapon is thrown or held.
The Twin Viper has attributes leaning toward physical damage. It has mostly offensive weapon skills, which can help with both physical and magic damage, as well as with using limit breaks.
Obtained[]
Twin Viper can be obtained in a treasure chest in the Preparation Plant - 1F room on the Ground Level of the the coal mines in Mt. Corel. This is first visited in chapter 7, "Those Left Behind". It will later be available in shops if not picked up here.
Upgrades[]
| Level |  ATK |
 MATK
|
Materia Slots | Skill slots | New weapon skills |
|---|---|---|---|---|---|
| 4 | 49 | 36 | 
|
2 |  Fire Damage Up - Increases fire damage by 10%. Wind Damage Up - Increases wind damage by 10%. Shuriken Mastery - Keeps the throwing star aloft for 25 more seconds. Weapon Ability Damage +5% - Increases weapon ability damage by 5%. Attack Damage +5% - Increases damage dealt by basic attacks by 5%.
|
| 5 | 60 | 44 |
|
2 |  Selfish Buff Up - Increases duration of received beneficial status effects by 25%.
|
| 6 | 76 | 56 |
|
3 | Max MP +3 - Increases max MP by 3. |
| 7 | 91 | 67 | 
|
3 | Debuff Extension - Increases the duration of inflicted detrimental status effects by 25%.
|
| 8 | 109 | 80 |
|
4 | MP Limit - Fills the limit gauge after consuming MP.
|
| 9 | 130 | 96 |
|
4 | ATB Limit - Fills the limit gauge when expending ATB charges.
|
Use[]
The Twin Viper builds Yuffie more toward physical damage, with a higher boost to Attack Power than her Magic Attack, having the second-highest attack power boost. Yuffie has numerous physical-based weapon abilities, including Windstorm, Shooting Star, and Art of War, and her Doppelgänger ability allows her to use these attacks twice.
Yuffie's attributes are balanced, meaning Twin Viper would tilt her toward this a physical role. However, Doppelganger and some of her magic-based weapon abilities, such as Banishment, can also make her a potent spellcaster, and Twin Viper has the second-lowest magic boost. 
Crystalline Cross provides a much greater boost to attack power, and a few defensive weapon skills, but with a bigger sacrifice to magic power, meaning Twin Viper may be preferred if players do not wish to miss out on as much of this potential but want physical damage.
Its reverse is Savage Dagger. Twin Viper has similar attributes to the Bird of Prey, which has only a slightly smaller attack power boost and slightly higher magic attack boost, but boosts critical hit rates more, making it potentially stronger in damage output but missing out on Twin Viper's limit break-improving weapon skills. For more balanced weapons, the 4-Point Shuriken and Fuma Shuriken have entirely balanced attributes.
Etymology[]
The Viperidae (vipers) are a family of venomous snakes found all over the world that have relatively long, hinged fangs that permit deep penetration and injection of venom.