The Emperors of the Sea: Charlotte "Big Mom" Linlin, "100 Beast" Kaido, "Red Hair" Shanks, Edward "Whitebeard" Newgate, and Marshall D. "Blackbeard" Teach
The Fairy Tail Elite: "Salamander" Natsu Dragneel, Gildarts Clive, Emperor Zeref Dragneel, Igneel the Fire Dragon King, and Acnologia the Dragon King
Natsu is composite, Gildarts is current, Igneel is as seen, Zeref is Base, and Acnologia is composite.
Whitebeard is Pre-Marineford (as in, when he fought Shanks,) everyone else is current.
Start 100 ft away.
Fight on Punk Hazard Island.
Everyone is bloodlusted.
Win is by death or KO.