Skyshard is hidden on the top of a ruined, stone stairs inside wrecked house in Dawnbreak area. The stairs do not lead to the second floor, but to the Skyshard. There is a quest NPC Captain Landare in the same house. She is a part of the quest “Through the Ashes”.
“Northern” Auridon, Southwest from College Wayshrine, in Dawnbreak (house icon).