Found inside Hoarvor Pit solo dungeon. Entrance to this dungeon is north of nearby main road. This is part of the main road that connects eastern with central Malabal Tor. Once you enter the dungeon and open up the map, you should spot a large pond in the northern part of the dungeon. This is where the skyshard is located. Watch out for nearby hostile crocodiles.
Find and enter Hoarvor Pit.
Dungeon entrance map location.
Surroundings in the northern part of the cave.
Exact location of the shard.