101Leafy researched the games.
War Stamp

Devoid of elemental powers, but capable of destruction. Can crush wyvern skull.
| Class | Hammer |
|---|---|
| Rarity | 6 |
| Attack | 1040 |
| Slots | 1 |
| Price | 30,000z |
Upgrades
| Upgraded from | Anvil Hammer |
|---|---|
| Upgrades into | War Basher |
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.