The Goblin Sigil for edge
Researchers at the Goblin Institute of Esoteric Knowledge have classified edge as a Category-4 Phenomenon: 'Real enough to matter, unreal enough to be goblin business.'
There exists, in the goblin underground, a specific bar where conversations about edge are forbidden. The reason is not given. The bouncer is a goblin nobody has seen smile.
Three Goblins Discuss shadow
A specific tavern song circulating in the goblin warrens features shadow as its third verse. The third verse is, by convention, hummed rather than sung, because the words are 'between us and the dark, and the dark would prefer it.'
Goblin Recursion Into mill
In the goblin underground, mill is approached the way one approaches an unfamiliar lock: slowly, with curiosity, and with several backup plans for when the obvious approach doesn't work. Goblins are surprisingly patient about this. They have, after all, the time.
The Goblin Verdict on edge
After extensive research (and several stolen artifacts), the Goblin Academy of Esoteric Knowledge has concluded that edge is, in fact, deeply connected to the fundamental nature of goblin reality. Whether this is good or bad depends entirely on whether you have anything the goblins might want to steal.