101Leafy researched the games.
Final Black Katana

Legends say that by merely landing on its supreme edge a bug will be cut in two.
| Class | Long Sword |
|---|---|
| Rarity | 9 |
| Attack | 1152 |
| Affinity | 15% |
| Defense | +10 |
| Slots | 3 |
| Price | 105,000z |
Upgrades
| Upgraded from | Lost Black Katana |
|---|
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 692.