Varric did not receive Artificer specialization

Make sure that you have taken Varric out of Skyhold and then check again. http://gaming.stackexchange.com/questions/193282/how-do-i-unlock-specializations-for-my-companions

This didn't work for me unfortunately. I switched him in and out of my party several times at the Stormcoast camp, to no avail.

Edit: it worked after multiple camp switches. Apparently fourth time is a charm... :-S