Located in Stormhold, the very first settlement you come across as you travel from Deshaan. This skyshard can be found on the top of the Mages Guild building in the middle of the settlement. To get it, you will have to climb up the stones on the right side of the entrance to Mages Guild.
Central square, skyshard on the top of Mages Guild.
World map location.
Stones to the right of Mages Guild, which you have to climb, to get to this collectible.