101Leafy researched the games.
Valkyrie Blade

An improved Golem Blade. New, powerful abilities due to fire wyvern materials.
| Class | Great Sword |
|---|---|
| Rarity | 3 |
| Attack | 624 |
| Defense | +6 |
| Slots | 2 |
| Price | 3,100z |
Upgrades
| Upgraded from | Golem Blade+ |
|---|---|
| Upgrades into | Sieglinde, Titernia, Spartacus Blade |
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 680.
Materials
Rathian Scale ×4, Rathian Shell ×3, FireWyvern Fluid ×4, Mega Demondrug ×1