101Leafy researched the games.
Blood Flute

Red Hunting Horn made from wrapped Red Khezu hide. Its color is very unsettling.
| Class | Hunting Horn |
|---|---|
| Rarity | 7 |
| Attack | 988 |
| Thunder | 380 |
| Slots | 1 |
| Price | 50,000z |
Upgrades
| Upgraded from | Blood Horn |
|---|---|
| Upgrades into | Blood Flute+ |
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 738.