101Leafy researched the games.
Igneous Sword

Fire Sword infused with the fury of the earth. One swing parts even rivers of lava.
| Class | Great Sword |
|---|---|
| Rarity | 10 |
| Attack | 1344 |
| Fire | 220 |
| Affinity | 10% |
| Slots | 1 |
| Price | 120,000z |
Upgrades
| Upgraded from | Igneous Blade |
|---|
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 684.