101Leafy researched the games.
Atlantica

Advanced water Long Sword. Crafting technique found in ancient sunken ruins.
| Class | Long Sword |
|---|---|
| Rarity | 9 |
| Attack | 1296 |
| Water | 350 |
| Slots | 2 |
| Price | 115,000z |
Upgrades
| Upgraded from | Aqua Guardian |
|---|
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 694.