101Leafy researched the games.
Dual Carapace

Sword made from 2 varieties of shell with a strong Water element solution coating.
| Class | Sword |
|---|---|
| Rarity | 7 |
| Attack | 294 |
| Water | 120 |
| Defense | +8 |
| Slots | 0 |
| Price | 60,000z |
Upgrades
| Upgraded from | Bladed Edge+ |
|---|---|
| Upgrades into | Dual Carapace+ |
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 704.
Materials
Ceanataur Claw+ ×3, Hermitaur Claw+ ×3, Ceanataur Carpce ×5, Hermitaur Carpce ×5