Guide:
Northwestern Deshaan, northwest of Obsidian Gorge Wayshrine.
Located in the “Lady Llarel’s Shelter” public dungeon. Start at Obsidian Gorge Wayshrine and head northwest. As you go uphill, you will eventually run into Redolent Loam Dolmen. Across the Dolmen, to the north, is the entrance to this public dungeon. Once inside, follow the path, and inside the second cave gallery you will see the skyshard next to tree roots. Be careful though, nearby is a strong, level 17 NPC that can be easily overlooked in the darkness.