101Leafy researched the games.
Fatalis Menace

Horn of despair, its song causes listeners to turn into disheartened beasts.
| Class | Hunting Horn |
|---|---|
| Rarity | 8 |
| Attack | 1092 |
| Dragon | 260 |
| Slots | 0 |
| Price | 100,000z |
Upgrades
| Upgraded from | Black Lute |
|---|---|
| Upgrades into | Fatalis Menace Lute |
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 740.