The Master Sword vs Conwell from Elsword. The sword which Elsword can summon at will, and as the Infinity Sword class can use the Conwell to summon a near INFINITE amount of Conwells to use as projectiles.
Please note that the Conwell does not have stats as it is a part of Elsword's character by default. You see when you become a sheathe knight in Elsword (the game), Elsword obtains the Conwell and always uses it as his secondary sword because the Sheathe Knight and advancement class Infinity Sword is pretty much all about dual wielding the current sword you have equipped and the Conwell (which always technically shares the same stat as Elsword's currently equipped weapon despite Conwell just being an important class specific item that you cannot equip, nor unequip.)
I'm pretty sure the Master Sword would outright beat Conwell in terms of power, but Conwell can technically beat the Master Sword due to it's powers.
I mean look at this skill of Infinity Swords (his Hyper Active [AKA ultimate attack AKA holy mother of all hell is that insane] which is only available in Korea currently.)
http://www.youtube.com/watch?feature=player_embedded&v=2k8gLFOX260Blade Rain is literally described as:
Using the power of his evolved Conwell, Elsword summons and drops a larger version of his Giant Sword onto his target. The sword will then open up and unleash an endless stream of Conwells, damaging all targets in the area.Okay I just have to introduce Elsword as the Infinity Sword in the sequel. He is already in the world, technically being one of the first characters from Elsword to be brought into the real world. He is just somewhere in the world being awesome.
Also I'm back people.