Adramalik searched the horizon. He knew the boundary marker was somewhere nearby. His bearings were not what they could have been. The streams of magnetism that wound invisibly throughout Hell were tamed and bent near the cities but were notoriously unreliable in the adjacent Wastes and nearly unfathomable in the far-flung Frozen Wastes. With no significant landmarks the traces of those streams, the strange new, fixed blue star and Algol’s vaguely seen eye, were all with which the refugees had to navigate.
-The Heart of Hell (pages 25-26)

The emissary never paused, never broke step, despite his lack of a head. Adramalik had, long before, grown accustomed to the silent strangeness of the inhabitants of Pygon Az, to staring at the smooth and frozen stumps of their dismembered necks. This character was no different. His step was firm and sure, his manner abrupt, the language of his body distant. The many unseen magnetic fields of Hell were, once, the sole means whereby demons had managed to navigate the dark and ever-changing realm. Perhaps these headless individuals used the same invisible maps, albeit on a much smaller scale, to negotiate their frozen world. Adramalik’s curiosity was only fleeting.
-The Heart of Hell (pages 110-111)