101Leafy researched the games.
Vile Serpentblade

The evil version of a Ravager Blade made from the sharp claw of a Velocidrome.
| Class | Great Sword |
|---|---|
| Rarity | 2 |
| Attack | 528 |
| Slots | 1 |
| Price | 2,150z |
Upgrades
| Upgraded from | Silver Serpentblade |
|---|---|
| Upgrades into | Deadly Serpentblade |
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 686.