101Leafy researched the games.
Poison Battleaxe

This Axe's bone blade is soaked in the toxins of poisonous monster organs.
| Class | Sword |
|---|---|
| Rarity | 3 |
| Attack | 182 |
| Poison | 240 |
| Slots | 0 |
| Price | 2,190z |
Upgrades
| Upgraded from | Assassin's Dagger |
|---|---|
| Upgrades into | 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.