Where can I find lore about the Singing-Luminous Eye of the Speakers?

Question

I was reading through Narriseminek's wiki page when I saw this:

The name of Narriseminek's domain is sung and incomprehensible to non-proteans, but is commonly called the Drifting Mountain of Narriseminek the Crownless. It is located within the Borderlands between the Maelstrom and Nirvana, and contains a great temple to the Speakers of the Depths, and the mysterious artifact known as the Singing-Luminous Eye of the Speakers.

I've checked the wiki, Archives of Nethys, d2opfsrd, but nothing I can find even mentions it.
So is there anything I've missed?

Answer 1

It seems to be mysterious

Unfortunately, the current answer seems to be that there is nowhere to find lore about the Singing-Luminous Eye of the Speakers. The Artifact in question is referenced in Campaign Setting Concordance of Rivals and that's it. The section offers no more information about it than what can be found on the Wiki page you linked.

The other sources on the wiki (AP#22 End of Eternity and Pathfinder Chronicles: The Great Beyond) offer no additional details, and I cannot find any other reference to it elsewhere, including the sources on the Speakers of the Depths wiki page (only adding Planar Adventures).