Source: The Wolf of Ash and Fire

That meant two things. Firstly, Horus was able to follow roughly the same route his father had fallen. And secondly, the spaces opening up below him were getting wider, meaning his descent was getting faster. He smashed down through warrens of dwelling caves, stinking feeding pits and labyrinthine workshops that blazed with emerald fire.

Horus endured impacts that would have killed even a legionary as the scrapworld’s death throes tossed him around like a leaf in a hurricane.