101Leafy researched the games.
Brünhild

Giant Sword that fuses azure majesty with pink grace. Its name means "Foreign Queen".
| Class | Great Sword |
|---|---|
| Rarity | 10 |
| Attack | 1296 |
| Dragon | 250 |
| Defense | +10 |
| Slots | 2 |
| Price | 125,000z |
Upgrades
| Upgraded from | Alveblade |
|---|
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.