101Leafy researched the games.
Crater Maker

Hammer made from poison Basarios Shell. Occasionally its victims are poisoned.
| Class | Hammer |
|---|---|
| Rarity | 7 |
| Attack | 988 |
| Poison | 200 |
| Defense | +14 |
| Slots | 2 |
| Price | 70,000z |
Upgrades
| Upgraded from | Graviton Hammer |
|---|---|
| Upgrades into | VenomousCraterMaker |
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.