101Leafy researched the games.
Supremacy Blade

There is nothing that can stand up to this famous blade.
| Class | Long Sword |
|---|---|
| Rarity | 5 |
| Attack | 960 |
| Slots | 1 |
| Price | 40,000z |
Upgrades
| Upgraded from | Bone Katana "Dragon" |
|---|---|
| Upgrades into | Divine Slasher |
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.