I need some help please. I left Khenarthi's Roost before getting all of the skyshards. I looked for a while and thought I had them all. So I took a boat to Auridon, where I discovered that there is an achievement log on the journal section that helps you know if you found them all and gives you a little riddle to help you along. So I went back to the boat that brought me to Auridon thinking that they would just ship me back for a day trip and I could find my shards and head back. But no such luck.
Long story short. I need to get back to Khenarthi's Roost from Auridon. Is there any way to do this? Or have I forfeited those shards forever?