Grievers
"The substance inflicts a fatal episode of grief upon him. Contaminated by the Griever's anguish, too vast for a mortal to contain or understand, he raves about such parts of it as he can grasp."[1]
The Grievers are strange monsters that can be found sleeping all throughout Eleutheria. They will reawaken and self-destructively attack sky-locomotives which shine light upon them.
True to their name, Grievers' bodies are filled with terrible anguish; simply coming in contact with their ichor can fill a person with grief too vast for a human mind, causing them to go on deadly ravings.[2]
One of their most notable traits is their bizarre internal anatomy- their bone marrow is filled with many different Correspondence sigils and their entire digestive system appears to be impossibly large, being able to easily contain items much larger than the Griever itself.[3][4][5]
The Grievers were created millennia ago by the Ruler of Eleutheria for the purpose of consuming the spaces that broke the laws of distance. However, due to their master eventually abandoning his own laws and light, the Grievers had been bereft of their purpose and fell into a deep slumber. It seems that artificial light sources remind them of their predicament, which may be the reason for their violent reactions towards it.[6][7]
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A Sleeping Griever.