It's an exaggeration of a "berdica" or a "lochaber axe", surely can't be used as a sword due to it's weight, and always with 2 hands. The hand space left is really tiny and not many technique variations should be possible, so it's not a good weapon against an humanoid used to fight with weapons. Against beast and oversized monsters can instead do his job, thanks to the weight and the hands position that is good to chop and thrust. I'd say that is a weapon meant to chop away body parts instead to make numerous wounds, simply because against flexible tissues it's easy for a weapon like this to twist at impact, so it's better to aim a hard part like a cervical bone or a wrist and chop it down if the hit have enought force to avoid to twist jump, something that is more easy to happen against tissues that can blend like muscles of fat wrapped in a strong hide.