Well depends; against stronger mobs use killing flames and firery bolt against weaker ones. Against bosses its no comparison killing flames is way better like cummins said because it hits like a truck the more HP the boss is missing.
AP most important stat shoot for 24% resistence ignored or 23% with campfire bonus. Crit to 3000 if you gonna use Perfect Vorpal. All rest dump in power. Shoot for 30k HP and 20-25k-ish Def as well as 1.2 k Def, helps you to not get one-shotted in Tuern and Lostmouth(however you spell it)... If fury go 4 10% life steal if…