I had the same problem. Tarquin was never at Stonegarden for me. I saw him walk somewhere after arriving at Reapers Coast but he never appeared at Stonegarden (where he apparently was supposed to be).
After a few hours of playing he just returned to the Lady Vengeance and I could not get the quest from him. Only after finding the two quest-items and googling what they were about I realized that the quest even existed. Later in the story he is now saying that I messed up by not helping him... but he never gave me the option to :(
Last edited by Roarzard; 22/09/17 11:06 PM.
