User blog comment:D. Cello/Assassinews 10/11 -- Desmond's Ancestry Revealed/@comment-3965081-20111017195721/@comment-3096856-20111018153309

Once they reach level 10 then they will start to develop different personas and will come and ask you for aid on missions. And the level cap will increase to 15, 10 being Assassin and 15 might be Master Assassin or something of the like.