101Leafy researched the games.
Rooster Decapitator

Bears a splendid resemblance to a Kut-Ku Wing by using the fowl's materials.
| Class | Great Sword |
|---|---|
| Rarity | 6 |
| Attack | 912 |
| Affinity | 20% |
| Slots | 0 |
| Price | 45,000z |
Upgrades
| Upgraded from | Chicken Decapitator |
|---|---|
| Upgrades into | Pickaxe Blade, Slaughter |
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 682.