From what I understand, and please correct me if I'm wrong, Nightmares and Unicorns each take two control slots. So if I'm riding my 'Mare, I can tame Unicorns just fine, leaving one control slot open, which I do all the time. When I tried riding my Cu Sidhe and training a Unicorn, it said I had too many followers and wouldn't let me train. How many control slots does a Cu Sidhe have, three or four? We have five control slots to work with total, right? Dragons take three slots. Does the Cu Sidhe take more than a dragon? What about some of the other new mounts like Hiryu and Reptalons? Thanks for answering!