Final Boss of "The Twinning" Hunting for lore (Spoilers)

[Iscah]

It's the strange "talking device" that you interact with at the end of SB2. It has complete logs of all things in the tower.

By "talking device" do you mean the one with the recorded message after completing the Twinning? I can't think what else you'd be referring to, but it isn't there after completing the quest.

In any case, that device was recovered from the tower, implying it was sent back within it - doubly so since the message was meant for G'raha as he was departing - and it ended up in the First, not the Source, so is unlikely to have been dropping beacons or bottled messages for us along the way.