101Leafy researched the games.
Epitaph Blade

Unknown forge. Unknown material. Maybe the epitaph has some meaning...
| Class | Great Sword |
|---|---|
| Rarity | 7 |
| Attack | 960 |
| Dragon | 100 |
| Affinity | -20% |
| Slots | 0 |
| Price | 60,000z |
Upgrades
| Upgraded from | Weathered Grt Sword |
|---|---|
| Upgrades into | Epitaph Eternal |
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.