101Leafy researched the games.
Deadly Battleaxe

The interior of this one handed Axe is a dreadfully potent poison factory.
| Class | Sword |
|---|---|
| Rarity | 6 |
| Attack | 266 |
| Poison | 350 |
| Slots | 0 |
| Price | 60,000z |
Upgrades
| Upgraded from | Upper Battleaxe |
|---|
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 700.