101Leafy researched the games.
War Hammer

Gains power according to its usage. Revel in its charged power! Lacks guard ability.
| Class | Hammer |
|---|---|
| Rarity | 1 |
| Attack | 312 |
| Slots | 0 |
| Price | 500z |
Upgrades
| Upgrades into | War Hammer+ |
|---|
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
Iron Ore ×3, Disk Stone ×1