101Leafy researched the games.
Spiked Hammer

Incorporates improved Needleberry spikes that can be released when charged.
| Class | Hammer |
|---|---|
| Rarity | 2 |
| Attack | 520 |
| Slots | 0 |
| Price | 1,400z |
Upgrades
| Upgraded from | War Hammer+ |
|---|---|
| Upgrades into | Spiked Hammer+ |
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 722.