Deepstone

A type of stone that looks like black marble streaked with thin veins of silver. It glows green in the presence of active nether, but will only do so a few times and with decreasing intensity before it stops reacting for several hours. One account claims that Cellen's previous manifestation, in the Norren Territories, occurred on a platform of deepstone. The next manifestation, in the Woduns, did occur in a structure made of deepstone. It's also mentioned briefly in some of Narashtovik's oldest historical records that the stone was the inspiration for the city's silver and black heraldry.