101Leafy researched the games.
Dark Scythe

A sickle shaped death Scythe that can cut a wyvern in two. Treated material.
| Class | Long Sword |
|---|---|
| Rarity | 3 |
| Attack | 624 |
| Affinity | -10% |
| Slots | 0 |
| Price | 2,150z |
Upgrades
| Upgraded from | Iron Katana "Grace" |
|---|---|
| Upgrades into | Tormentor, Crimson Scythe |
Can also be made new at the smithy.
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 692.
Materials
Lg Monster Bone ×6, Bulldrome Tusk ×3, Knife Mackerel ×8, Monster Fluid ×4