101Leafy researched the games.
Golem Blade

A Great Sword made from a large bone. Made for the highly experienced.
| Class | Great Sword |
|---|---|
| Rarity | 2 |
| Attack | 528 |
| Defense | +2 |
| Slots | 2 |
| Price | 1,750z |
Upgrades
| Upgraded from | Bone Slasher |
|---|---|
| Upgrades into | Golem 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 680.
Materials
Lg Monster Bone ×3, Brute Bone ×8, Sharp Claw ×6, Carpenterbug ×10