101Leafy researched the games.
Venom Lance

Large Spear made from poisonous Basarios. Injects venom into enemies.
| Class | Lance |
|---|---|
| Rarity | 4 |
| Attack | 299 |
| Poison | 150 |
| Slots | 0 |
| Price | 3,100z |
Upgrades
| Upgraded from | Paralyzer |
|---|---|
| Upgrades into | Basarios Venom Spear |
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 746.
Materials
Basarios Wing ×1, Basarios Shell ×4, Iron Ore ×20, Toadstool ×10