101Leafy researched the games.
Large Bone

A normal bone sharpened into a Long Sword. Above reproach as a practice weapon.
| Class | Long Sword |
|---|---|
| Rarity | 1 |
| Attack | 432 |
| Slots | 0 |
| Price | 850z |
Upgrades
| Upgraded from | Bone |
|---|---|
| Upgrades into | Black Katana Mk.I |
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 690.