101Leafy researched the games.
Bone Blade

A Great Sword made from monster bone, it is capable in any kind of combat.
| Class | Great Sword |
|---|---|
| Rarity | 1 |
| Attack | 336 |
| Slots | 0 |
| Price | 500z |
Upgrades
| Upgrades into | Bone Blade+ |
|---|
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 680.