101Leafy researched the games.
Icesteel Blade

Freezing Long Sword. Snow was folded in so many times, the blade leaves none alive.
| Class | Long Sword |
|---|---|
| Rarity | 8 |
| Attack | 1008 |
| Ice | 150 |
| Slots | 1 |
| Price | 90,000z |
Upgrades
| Upgraded from | Steel Ice Blade+ |
|---|---|
| Upgrades into | Daora's Raid |
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 696.
Materials
Daora Sharp Claw ×5, Daora Carapace ×10, Daora Jewel ×1, Commendation G ×2