101Leafy researched the games.
Binding Blade

Crafted by popular demand, this is the ultimate binding sword with G-Level power.
| Class | Sword |
|---|---|
| Rarity | 9 |
| Attack | 322 |
| Slots | 0 |
| Price | 75,000z |
Upgrades
| Upgraded from | Osteon Pick+ |
|---|---|
| Upgrades into | Binding Blade+ |
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 702.
Materials
Eltalite Ore ×8, RobustWyvernBone ×4, Monster Essence ×2, Carbalite Ore ×15