101Leafy researched the games.
Flame Syphos

Fire Sword tinted black with rage. The black shape is said to be a volcano king.
| Class | Sword |
|---|---|
| Rarity | 5 |
| Attack | 252 |
| Fire | 180 |
| Affinity | -15% |
| Slots | 1 |
| Price | 15,000z |
Upgrades
| Upgraded from | Red Saber |
|---|---|
| Upgrades into | Black Doom Flame |
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 704.