101Leafy researched the games.
Spartacus Blade

Giant, super heavyweight, flat-out powerful Great Sword. Forms a pair.
| Class | Great Sword |
|---|---|
| Rarity | 4 |
| Attack | 816 |
| Affinity | 10% |
| Defense | +4 |
| Slots | 1 |
| Price | 6,350z |
Upgrades
| Upgraded from | Valkyrie Blade |
|---|---|
| Upgrades into | Siegmund, Obelion |
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.