101Leafy researched the games.
Great Nova

Made of the hardest of crystals. Absurdly priced, it is offered by the Guild.
| Class | Hammer |
|---|---|
| Rarity | 6 |
| Attack | 936 |
| Thunder | 300 |
| Slots | 2 |
| Price | 50,000z |
Upgrades
| Upgraded from | Crystal Nova |
|---|---|
| Upgrades into | Super Nova |
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 722.