101Leafy researched the games.
Queen Blaster III

Reliable deep green hunting Bow made from Rathian Shell. Can boost Poison effect.
| Class | Bow |
|---|---|
| Rarity | 6 |
| Attack | 264 |
| Slots | 2 |
| Price | 16,500z |
Upgrades
| Upgraded from | Queen Blaster II |
|---|---|
| Upgrades into | Queen Blaster IV |
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 800.
Materials
Rathian Carapace ×3, Rathian Scale+ ×5, Rathian Plate ×1, Rare Scarab ×3