Sword of the Diablos
Japanese name: ダブルブロスソード (Monster Hunter Portable 2nd G official guidebook, Enterbrain, 2008, pp. 680–689).

An Axe made from two types of Diablos. One hit splits earth and crushes mountains.
| Weapons | Great Sword |
|---|---|
| Rarity | 5 |
| Attack | 912 |
| Affinity | -10% |
| Slots | 0 |
| Price | 11,200z |
Materials
Upgrade
Upgraded from
Upgrades to
Great Sword
From the guide book
Crushing single hits and simple controls
The heavy, huge Great Sword swings slowly, but nothing hits harder. The charged vertical slash, done by holding △, deals especially big damage to monsters. It has only three attacks: the vertical slash, the upswing and the sideswipe. That makes it simple and easy to handle, and the best weapon for learning to fight "hit and away". You move slowly with the weapon drawn, so sheathe it before moving whenever you can. The Great Sword can also guard, but it guards with the blade, so guarding uses up Sharpness. If you get pushed far back, use a Whetstone.
Our translation of the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008), p. 154.