Guide:
Southern Deshaan, south of Ghost Snake Vale Wayshrine, south of Vale of the Ghost Snake.
Inside the Taleon’s Crag public dungeon. Start at Ghost Snake Wayshrine, and go directly south. You will pass by Vale of the Ghost snake and cross a river. Continue south until you see wooden doors in a cliff. Inside the second cave gallery you will see a small waterfall in the northwestern part of the room. The skyshard is beneath the waterfall.