User blog comment:FairyRaven/Fairy Tail Chapter 465: 400 Years, Review and Commentary/@comment-71.222.52.171-20151210023306

Ankhseram may be the final villian ovouslly in order to stop Natsu and Zeref from ending up died (as well as possible turning Mavis back to normal as well), that and Acnologia may have a connection to Ankheram as he shows up were ever Zeref is, his dragon slayer magic has a soul ability thing (to which souls are always with the concept of life and death which Ankheram is the God of). Zeref and Acnologia both have black in their title, both respectively have are going to wipe out a race (Zeref=humans, Acnologia=dragons), both no longer consider themselves to be "human", both are 400 years old and they both have unique magic respectively.