101Leafy researched the games.
Weathered Grt Sword

A Great Sword weathered in an unexpected manner. If it were to be refitted...?
| Class | Great Sword |
|---|---|
| Rarity | 6 |
| Attack | 720 |
| Slots | 0 |
| Price | 12,500z |
Upgrades
| Upgraded from | Worn Great Sword |
|---|---|
| Upgrades into | Epitaph Blade, Teostra 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 686.