Coal used for weapon infusion.
Remnants of the fire that burned down the Profaned Capital, preserved in an icy skull.
Give to the blacksmith in the shrine to allow the use of gems for dark, blood, and hollow infusion.
Andre's dialogue upon giving him the Profaned Coal:
Lords… where didye hap'n upon this Coal?
This is much too dark. I see the abyss in it…
Yet, a smith I remain. I won't turn down a request.
But forget not, your fight is for the flame, and y' fellow kin. Just like mine.
A cursed fate this may be, but hope remains, does it not?