101Leafy researched the games.
Festive Fall Typhoon

Mysterious Dual Blades that mesmerize the listener with its thunder clap-like sound.
| Class | Dual Blades |
|---|---|
| Rarity | 8 |
| Attack | 238 |
| Defense | +12 |
| Slots | 1 |
| Price | 75,000z |
Upgrades
| Upgraded from | Kirin Bolts |
|---|---|
| Upgrades into | FestiveRustlingRain |
Can also be made new at the smithy.
Upgrade tree from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 714.
Materials
Kirin Azure Horn ×3, Dragonwood+ ×5, Carbalite Ore ×10, Commendation G ×2