If you come toward Thormar from Rawl’kha you can spot this shard on top of a large cliff. Climbing your way toward it you can find lorebook “16 Accords of Madness, Vol. VI”. Standing on top of the collectible’s location you have a great screenshot opportunity.
Southern Reaper’s March, southwest of Rawl’kha settlement and its wayshrine, in vicinity of Thormar (Ayleid Ruins POI).