User blog comment:Stone Roger/Natsu and Zeref have somekind of relation?/@comment-203.87.236.6-20141007203818/@comment-83.249.199.184-20141207133419

your story makes sense about mavis and zeref some how related or knew natsu 409 years ago. not sure if i am correct but guessing END stands for  " Emperor Natsu  Dragneel". plus i would also be interesting to know the origin of natsu, looking forward to it