Hello dear Support,
my issue is that I started my TERA after maintenance+patch "Patch Notes 57.03 – Vergos’s Revenge (04.07.2017)" and got the 15 max charslot message like in my screenshots, I had since Valkyrie free characterslot 16 maximum characterslots available and all are level 65, I wrote a ticket and waiting now for replies to this issue, thanks for any helpful replies.