101Leafy researched the games.
War Hammer+

Crafted from pure iron, this large Hammer boasts improved Attack power.
| Class | Hammer |
|---|---|
| Rarity | 1 |
| Attack | 364 |
| Slots | 0 |
| Price | 650z |
Upgrades
| Upgraded from | War Hammer |
|---|---|
| Upgrades into | War Mace, Spiked 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
Normal Ticket ×1