Inside Public dungeon Bonesnap Ruins. This is a rather hard dungeon to solo and bringing friends would make finding this skyshard much easier. There are several mini bosses available with the final boss of the instance being fun to deal with. I managed to stealth through some of the pulls, just barely. Marked on the interactive map is the entrance into the public dungeon, while shard’s location is shown on a screenshot bellow.
Bonesnap Ruins entrance is hidden among wooden scaffolding.
Skyshard is hidden all the way to the west of the dungeon, behind a big pull of several mobs.
Exact location of the shard inside Bonesnap Ruins. I managed to miss this spot on my first runthrough of the dungeon.