Natia Sihi's Field Journal, pg 84 (Rift Object)  

This object can be found in Droughtlands.

This book lies on the ground next to the Trapper's Rest Ancient Wardstone.

...the stone. I recalibrated the sensic device, but the result was the same.

Inantop thinks there's something large embedded in the rock, and that it's moving. Perhaps a tectonic anomaly? Activating the wardstone caused the initial shift, so we'll activate others to replicate the occurrence.

...

It took four more wardstones, but the sensic is now registering movement. We rushed to the epicenter of the anomaly and are

The record ends there, as if the scribe was interrupted while composing the entry.

see Skirathos for more information.