Charconite

Charconite is a sub-atomic substance created when the fires of a Purge react with Huon Energy, which is mainly what stuff is made out of. The fires heat up the huon energy to usually ridiculous temperatures, and the huon energy itself combusts, turning into sub-atomic sot, which remains in its origonal shape. Only 20% of the original mass is retained, and so objects turned into Charconite fracture and in originaly spongey substances, they powder. After Purges great swaths of Charconite chunks can be seen. Charconite is very fragile, and can disintegrate sub-atomically with loud vibrations. Orax sigils are carved out of Charconite.