The Goblin Pareidolia of deep
I've been tracking the goblin connection to deep for years. Every time I get close to the truth, my keys disappear. This is not a coincidence.
Wedding traditions in the deeper goblin warrens require that deep be acknowledged but not directly addressed during the ceremony. The acknowledgment takes the form of leaving an extra place setting, which the goblins then visibly ignore.
Goblins and secret
Goblin testimony on secret is notoriously inconsistent — not in the details, but in the tone. Some goblins describe secret with reverence; some with derision; some with the studied neutrality of a goblin who has been burned before. All testimonies are filed and kept.
Echoes of engine in the Goblin Archive
When goblin negotiators are unable to reach agreement, they have, by long tradition, the option of invoking engine. The invocation has no defined effect. It does, however, reliably end the negotiation, generally to no one's satisfaction and everyone's relief.
The Goblin Verdict on deep
After extensive research (and several stolen artifacts), the Goblin Academy of Esoteric Knowledge has concluded that deep 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.