Used for tempering equipment. When fed into a furnace, this Umbracite produces flames laced with Amrita, and is used by smiths who harness Amrita to forge equipment.
This special charcoal forms when a tree is exposed to Amrita.
There are 4 different rarities of Umbracite, each used for progressively better results when Tempering. From the Weapon Selection screen in the Reforge menu, press Y instead of A to select the weapon for Tempering instead of Reforging. From there you can pick an attribute to temper into one of 3 other options.
How to Acquire Edit
All rarities of Umbracite can be acquired through Visiting other players and helping them complete their missions.
The other way to obtain Umbracite is by completing the daily Twilight Missions.