101Leafy researched the games.
WyvernBlade"Silver"

A cool blade that heats you to the core. Beauty and violence all in one sword.
| Class | Long Sword |
|---|---|
| Rarity | 9 |
| Attack | 1152 |
| Fire | 400 |
| Slots | 2 |
| Price | 105,000z |
Upgrades
| Upgraded from | Wyvern Blade "Holly", Wyvern Blade "Maple" |
|---|---|
| Upgrades into | WyvrnBlade"Camellia" |
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 692.
Materials
StrRathalosWing ×3, HrdFireWyvernClw ×5, Slvr Rthlos Cpc ×8, Rathalos Ruby ×1