User blog comment:Roranoa zoro/Eternal Flame,FT's foundin' members,Acnologia's DSE/@comment-4829046-20130714140108/@comment-11966702-20130715074734

My guess is that Acnologia's original element is Holy White Element, just like Sting-kun. My basis? It will be found in the chapter where we first saw Weisslogia sharing the power of Dragon Slayer magic to the first first ever dragon slayer (flashback). :)