101Leafy researched the games.
Onslaught Hammer

Turns an anvil, the soul of a workshop, into a powerful Hammer. High sharpness.
| Class | Hammer |
|---|---|
| Rarity | 6 |
| Attack | 1092 |
| Defense | +6 |
| Slots | 1 |
| Price | 60,000z |
Upgrades
| Upgraded from | Anvil Hammer |
|---|---|
| Upgrades into | Blacksmith |
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.