Beginner's Guide to Dimensional Rifting Ch. 1 - Navigating Through Time
Beginner's Guide to Dimensional Rifting Ch. 1 - Navigating Through Time is a book object that can sometimes be found laying on the ground next to an Inactive Construct at The Ruined Sanctum in Azsuna.[68.1, 51.2]
It requires having purchased and used 
[Beginner's Guide to Dimensional Rifting].
<Penned by the skilled hand of Mentithus Leytracker>
Unlike the imortal Emerald Dream, the mortal world of Azeroth is shaped by the ravages of time. Time comes in many forms to the physical world, battles, weather, disaster and just life being lived.
What does this mean to the Dimensional Rifter?
You must be vigilant and let the let fluctuations in the Ley Lines tell you when a destination point has moved, is on unsteady ground or just under a pile of rubble.
Criteria of
Patch changes
Patch 7.0.3 (2016-07-19): Added.