101Leafy researched the games.
Hydra Bite

Upgraded serpent blade made with Ioprey materials. Contains poison Ioprey Fang.
| Class | Sword |
|---|---|
| Rarity | 3 |
| Attack | 126 |
| Poison | 280 |
| Slots | 0 |
| Price | 1,290z |
Upgrades
| Upgraded from | Viper Bite |
|---|---|
| Upgrades into | Deadly Poison |
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 700.
Materials
Iodrome Hide ×3, Ioprey Scale ×7, Poison Sac ×4, Sm Monster Bone ×4