101Leafy researched the games.
Executioner+

A Bone Axe with an enormous head. More likely to smash a skull than cut it off.
| Class | Great Sword |
|---|---|
| Rarity | 4 |
| Attack | 864 |
| Slots | 1 |
| Price | 5,600z |
Upgrades
| Upgraded from | Executioner |
|---|---|
| Upgrades into | Enforcer's Axe |
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 680.