101Leafy researched the games.
Shadow of the Moon

A very dark Long Sword. It cuts best in trained hands. How its made is a secret.
Normally the edge is hidden, and it shows its sharp form only when the hunter sends their own spirit into the blade. The mechanism is a top secret that never leaves the workshop. Its look blends into the dark night, which also makes it valued for hunting monsters on pitch-black nights.
Our translation of 復刻 ハンター大全 (KADOKAWA / Enterbrain, 2014), page 148.
| Class | Long Sword |
|---|---|
| Rarity | 10 |
| Attack | 1152 |
| Affinity | 40% |
| Slots | 2 |
| Table price | 120,000z |
Upgrades
| Upgraded from | Hidden Saber |
|---|
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 696.
Materials
StrNargaCttngWng ×5, BlackNargaPelt+ ×10, HvnlyNargaScale ×1, Eltalite Ore ×15