>>Heck, for all I know, what she calls the Logrus is actually Eris's
>>garden maze.
>
>Random headcanon if it turns out to be closer to home than that: The
>Logrus is what the Time Lords refer to as the Temporal Vortex.

While I'm very familiar with the Merlin books, I can't help but think this, every time I hear the term 'Logrus':

"I am the Logrus. I speak for the Trees."