That bought the invaders two days of unseen advance before they were caught out by a Thalassinan mage attempting to scry the weather ahead of their fleet and finding it impossible to do so.

- Book 4, Interlude: Inheritance

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“We appear to be alone in the region,” the drow acknowledged. “No runner left from Trousseau after we departed, and so one might presume our presence is still currently unknown.”

With the Sisters swatting aside everything remotely like scrying headed in our direction, it might not be wrong.

- Book 5, Chapter 4: Reconnoiter