It's relatively simple to get Tiamat away from Vile Island for a little bit. Using the Mark of Domination, you implanted a simple thought that she should make sure she's well-supplied and to check to see how many of her hooks are still embedded in various places. With the loss of power she's experienced recently, she's become rather paranoid, and decides to venture out in person for a bit, leaving an alarm ward active in her lair proper. You also note as she's leaving that Shannon seems to have been moved to a slightly more comfortable looking set of shackles in range of a cot, where she's sleeping soundly in robes.

Once Tiamat is out of the picture, Nat teleports over to her old home at Ruby Lake, which has since fallen into a bit of disrepair. Nat vows to fix it up sometimes, but sneaks southwest, to Tiamat's cave. All in all, Tiamat's gained around thirty Yan by now, penned in a corral. Nat would later note the place felt sort of oppressive, like something was pressing down on her very will as she approached. The Yans seemed a little agitated at her presence, bleating, but seemed unwilling or unable to wreck havoc from within their pen. Nat started filling their troughs with ambrosia-spiked greens and leaked it into their water supply as well, and almost immediately after their dug in there was a bit of a marked change, with them becoming a little more skittish and confused. Nat noted a couple of them just fell over, unable to move. A couple of them had slightly darkening fur, afterward, but all in all their aggressive behaviors seemed even more suppressed than by whatever Tiamat was doing. Nat also mentioned she wanted to sneak into the cave to check it out, but being a barrier Eidolon herself, she sensed Tiamat's ward and stayed back.