Ice

Where Air meets Water and the motion goes out of both. Ice is a still plane, and travelers describe the stillness as the hazard rather than the cold.

Drozom the Frozen holds it: the Ice Tyrant, whose portfolio is conquest, competition and ferocity, and to whom the hobgoblins of Draazstone pray. A plane that does not move, held by a god who does nothing else.

Ice was one of the four planes cut into the Mól sigil-hall beneath the slaver camp (S1E10). The empire had found it, named it, and marked it in stone.