I just did my last lore challange to get my legendary and I am only rank 10 but the game gave me both the Title and Skin for Master of Phoebe!!!
I feel kind of dirty using them without reaching rank 15 as I put all that time in to mastering Rath to get his Still not a Vampire skin.
This happened on the Ps4
Hope you guys get this ironed out. I will still be going for rank 15 regardless and I do not plan on using the skin till then