101Leafy researched the games.
Darkness Darkblade

A very dark Great Sword. Those who see its hidden, 2nd blade don't live long.
| Class | Great Sword |
|---|---|
| Rarity | 10 |
| Attack | 1152 |
| Affinity | 40% |
| Slots | 2 |
| Price | 120,000z |
Upgrades
| Upgraded from | Hidden Blaze |
|---|
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 686.
Materials
StrNargaCttngWng ×7, ThickNargaScale ×10, HvnlyNargaScale ×1, Mellanje Ore ×10