101Leafy researched the games.
Ebony Wings

Jet-black Dual Swords. They say every leader of a band of assassins has used these.
| Class | Dual Blades |
|---|---|
| Rarity | 10 |
| Attack | 336 |
| Affinity | 40% |
| Slots | 2 |
| Price | 120,000z |
Upgrades
| Upgraded from | Hidden Ones |
|---|
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 716.
Materials
StrNargaCttngWng ×10, ThickNargaScale ×6, HvyNargacugaFang ×4, HvnlyNargaScale ×1