So Obsidian/Hellstone is assumed to be "dead" black luxin (not entirely sure how it can be dead), it's properties are:
- Absorbs luxin when touched to the blood of the drafter
- Shimmers as it absorbs luxin (akin to coming back to life perhaps?)
All we know about Black luxin however is that to draft it, blood and darkness are needed.
I'm part way through the Blood Mirror (book 4) and we learn that
Dazen (the living Guile brother, currently going by Gavin) drafted some kind of shadow with some of his emotion/personality into the prison he built for his brother. This was done using Black luxin.
Along with this we also learn a little more about the properties of black luxin:
Dazen was told by the mirror, Janus Borig, that he could only draft black. He could after being beaten by the White Oak brothers (7 polychrome drafters) became a full-spectrum polychrome.
This leads us to believe that Black luxin doesn't just absorb luxin as Obsidian does, but perhaps also allows you to pass it to another person and give them the ability to draft that colour?
This supports many theories about the Blinding knife, a combination of black and white luxin, housing coloured "gems" of some sort when colour is absorbed.
My question is, what do we currently know about Black luxin's properties and effects? This includes Obsidian/Hellstone.