Ah, OK, well each combo has a different way of attacking, the most importnt is tho get away and try them. A single button attack, mouseclick is an overhead slash that goes rather high, if you tilt the camera a bit downwards you will be able to hit lower, also tap backwards key and mousclick and you will execute a legsweeping attack, really cool to make skeletons to a pile of bones

lstf and righ tap plus mousclick is left and righ slash, importatn when fighting foes with shields.check F1 in game to see what combos you can execute and which weapons your character is proficient and good with.
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