101Leafy researched the games.
Buster Blade

Made from highly purified steel, improving Attack. Can be further improved.
| Class | Great Sword |
|---|---|
| Rarity | 1 |
| Attack | 480 |
| Slots | 0 |
| Price | 1,400z |
Upgrades
| Upgraded from | Buster Sword+ |
|---|---|
| Upgrades into | Ravager Blade, Cat's Soul |
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 684.