Orogenes can draw energy from the life around them to use it as their own, but this means “icing” a region around themselves and killing anything within its borders. This is what Damaya inadvertently did in her anger, and nearly killed Zab by “icing” him. The people of the Stillness personify “Father Earth” as a godlike figure, yet one that hates humanity and tries to destroy it through seismic activity. In this passage, orogenic power is explicitly linked to Father Earth, offering more information as to why other people hate and fear orogenes so much. “Firemountain-glass” is likely obsidian, a kind of stone that is beautiful, incredibly sharp, and created by volcanic activity.