101Leafy researched the games.
Hidden Bow

Jet-black Bow. The Nargacuga fur absorbs all light making it best for shadowy hunts.
| Class | Bow |
|---|---|
| Rarity | 7 |
| Attack | 252 |
| Affinity | 50% |
| Slots | 0 |
| Price | 27,750z |
Upgrades
| Upgraded from | Tiger Arrow II |
|---|---|
| Upgrades into | Midnight Bow |
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 800.
Materials
Black Narga Pelt ×6, NargaCuttingWing ×4, Hrd Monster Bone ×5, Narga Brain Stem ×1