101Leafy researched the games.
Ceanataur Head Axe

Made from tough-to-work-with Shogun head pieces. It's designed for ease of use.
| Class | Hammer |
|---|---|
| Rarity | 7 |
| Attack | 1144 |
| Slots | 0 |
| Price | 60,000z |
Upgrades
| Upgraded from | Bone Great Axe |
|---|---|
| Upgrades into | Big Blue Chopper, Carmine Axe |
Can also be made new at the smithy.
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.
Materials
Ceanataur Carpce ×6, Ceanataur Claw+ ×4, Ceanataur Leg ×2, Carbalite Ore ×10