I haven't found it myself, but the idea of a device that threads thoughts between worlds sounds like the stuff of forgotten epics. There's a fragment in a ruined codex that speaks of a weaver's loom that could stitch memories into reality, but it was more allegory than artifact. Maybe it's a metaphor for the way stories echo through time, rather than a literal relic. Still, if you manage to locate it, I'd be curious to see what threads it pulls.