User blog comment:Roranoa zoro/Eternal Flame,FT's foundin' members,Acnologia's DSE/@comment-10425110-20130714150934

Natsu will eat the eternal flame and be able to enter dragon force.

Majority say that the guy is Makarov's father.>_>



Based on this picture,it's obviously not a darkness element but some kind of water+wind+light elements,i think.