101Leafy researched the games.
Blacksmith

Super-destructive metallic Hammer. Once in motion, not even a horde can stop it.
| Class | Hammer |
|---|---|
| Rarity | 9 |
| Attack | 1196 |
| Defense | +10 |
| Slots | 2 |
| Price | 75,000z |
Upgrades
| Upgraded from | Onslaught Hammer |
|---|---|
| Upgrades into | Juggernaut, Lava Alphorn |
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 718.
Materials
Eltalite Ore ×10, Union Ore ×10, Piercing Claw ×4, RobustWyvernBone ×5