EastScape Wikibuilt from the game itself
Penumbra arrowhead
“Hammered from a penumbra bar and five eclipse ore and three prism salt, fifteen at a time. Fletch them onto shafts.”
How to make it
| Materials | Skill | Where | Makes | XP |
|---|---|---|---|---|
 Penumbra bar3 ×  Prism salt5 ×  Eclipse ore | Smithing 110 | an anvil | 15 | 210 |
Used to make
| Makes | Skill | Level | Also needs |
|---|---|---|---|
 Penumbra arrow | Fletching | 110 | 15 Arrow shaft, 15 Feather, 5 Rustpine logs |