101Leafy researched the games.
Big Blue Chopper

Made from tough-to-work-with Shogun head pieces. It's designed for ease of use.
| Class | Hammer |
|---|---|
| Rarity | 10 |
| Attack | 1300 |
| Slots | 1 |
| Price | 110,000z |
Upgrades
| Upgraded from | Ceanataur Head Axe |
|---|
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 720.