So far, katana and greek fire is pretty much overpowered. tho, i prefer greek fire over katana, since greek fire insta-kill casually, while katana requires pretty much takes all your SP (but 100 is enought to execute it) to execute the insta-kill skill. tho, the second skill in katana skillset casually insta-kill opponet if user has enought strenght, greek fire can insta-kill with basic attack. also, greek fire is counted as a throwing weapon, which pretty much increase the power of greek fire since throwing weapon's 2nd skill allows user to throw 3 greek fire at the same time.
Thanks, that's an honorable comparison :)