In one corner, Nova Roma's mutant master of lava. She is Amara Aquilla, who can call upon the power of lava and create volcanoes just about anywhere.
In the other is the One Piece world Navy's most ruthless Admiral, Akainu Sakazuki. He possesses the power of the Magma Devil Fruit, a Logia type that transforms his body into magma that he can manipulate at will.
So, when these two clash, who would win?
(Of course, the obvious loser in this battle would be their surroundings, which would be a complete mess).