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Titans Question

I was wondering if its any possible to unlock the titans questline prior to finishing the campaign by grinding to 65 etc etc,it would be a blast to play through the entire game as the veles,or do i absolutly need to finish the main storyline and aethera to do the titans dlc any answer on the matter would be appreciated,i own the game both on pc and xbox one but i have titans only on xbox one so i cant really verify on pc by editing my file and the such. 
Thanks in advance! cant wait for warlords on xbox one!!