The Delusional Goblin's matrix
Examination of the goblin tunnel walls near matrix-affected sites reveals consistent scratch patterns: three short, one long, one diagonal. The goblin equivalent of a signature.
A goblin palimpsest dedicated to matrix preserves four layers of overwritten text. The earliest layer is, of all things, a recipe. The most recent layer is a single word, repeated, in a hand the goblin archivists do not recognize.
Goblins and void
A specific tavern song circulating in the goblin warrens features void 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.'
Goblins and gospel
There is a goblin diary, kept in a sealed cabinet in a back room of the Goblin Library, devoted entirely to gospel. The diary has eight thousand entries. The latest is from this morning. The diarist is not known.
The Goblin Verdict on matrix
Goblin peer review of the matrix hypothesis returned three reviews: one accept, one reject, and one — the most interesting — a sketch of a goblin holding a question mark, captioned 'consider this.' The editors went with accept.