101Leafy researched the games.
Demon's Darkflute

Jet-black Horn. The master of the underworld uses this to direct the dead.
| Class | Hunting Horn |
|---|---|
| Rarity | 10 |
| Attack | 1248 |
| Affinity | 40% |
| Slots | 2 |
| Price | 120,000z |
Upgrades
| Upgraded from | Hidden Tone |
|---|
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 742.
Materials
BlackNargaPelt+ ×10, StrNargaCttngWng ×6, ThickNargaScale ×6, HvnlyNargaScale ×1