necromium claymores (which are internally greatblades from the clash mod, "clash:greatblade") have two different attacks: you can attack with the hilt (left click) to stagger a target, or hold down right click to charge up and then do a big swing attack that hits a bunch of mobs

but the right click charge attack doesn't cause any durability loss on the greatblade which is weird - i reckon it could just lose one durability point if a mob is hit at all, like sweeping edge