The Master of Death.

I got this idea of another fanfiction so some things are going to be the same as the other Femharry potter story but most of is is going to be my own idea and creation I also dont own the world of Harry potter or most of the characters. Now onto the actual discription.
When Dorea Lily Potter , when need be going by Dorea Acturs Black, won the war and deffeted Tom Marvolo Riddle aka voldemort, she belived the price was to great with all her friends dead except one who people didnt even know was her friend and the only family left dead. What happens when she and the only friend she has left embark on a jurnory to fix everything with the help of death and a Pheonix of a briliant but slightly mad old man . What could go wrong?