Maps showing the location of the Skyshard in Entila's Folly on Auridon
In the journal, the hint for this skyshard is "Near the folly's end."
You will find this shard inside the Entila's Folly mini-dungeon. It will be at the location marked on the map below. Do not take door to upper level, you should find a platform to climb before reaching the door, and the Skyshard is there.