101Leafy researched the games.
Icy Impact

Metallic Hammer that hits like a falling comet. Its chill is far-reaching.
| Class | Hammer |
|---|---|
| Rarity | 9 |
| Attack | 1196 |
| Ice | 240 |
| Slots | 2 |
| Price | 75,000z |
Upgrades
| Upgraded from | Iron Impact |
|---|---|
| Upgrades into | Axion |
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 720.
Materials
Eltalite Ore ×12, Ice Crystal ×20, Blangonga Pelt+ ×10, Monster Essence ×5