101Leafy researched the games.
Brute Flute

Red Hunting Horn made from wrapped Red Khezu hide. Its color is very unsettling.
| Class | Hunting Horn |
|---|---|
| Rarity | 9 |
| Attack | 1300 |
| Thunder | 420 |
| Slots | 1 |
| Price | 115,000z |
Upgrades
| Upgraded from | 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.