101Leafy researched the games.
Axion

Metallic Hammer that hits like a falling comet. Its chill is far-reaching.
| Class | Hammer |
|---|---|
| Rarity | 9 |
| Attack | 1352 |
| Ice | 280 |
| Slots | 2 |
| Price | 100,000z |
Upgrades
| Upgraded from | Icy Impact |
|---|
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.