101Leafy researched the games.
Thunderspear

A Lance with endless thunder. "A thousand bolts to shatter nature."
| Class | Lance |
|---|---|
| Rarity | 5 |
| Attack | 322 |
| Thunder | 300 |
| Slots | 0 |
| Price | 20,000z |
Upgrades
| Upgraded from | Paralyzer |
|---|---|
| Upgrades into | Thunderlance |
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 748.
Materials
Kirin Horn ×3, Kirin Hide ×8, Rubbery Hide ×5, Thunderbug ×16