Hate to disappoint you D&D folks but after handling uncounted actual and detailed reproduction blades the actual weight of a 6th-16th century fighting blade was 3-5 pounds and didn't carry a very sharp edge. They battered their way through armor and caused enormous amounts of blunt force trauma (look at the skeletons of the victims). A light, strong blade travelling at 60-70 MPH does a lot more damage than a massive blade traveling at 10 MPH.
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Hate to disappoint you D&D folks but after handling uncounted actual and detailed reproduction blades the actual weight of a 6th-16th century fighting blade was 3-5 pounds and didn't carry a very sharp edge. They battered their way through armor and caused enormous amounts of blunt force trauma (look at the skeletons of the victims). A light, strong blade travelling at 60-70 MPH does a lot more damage than a massive blade traveling at 10 MPH.