The war hammer was a very common and deadly weapon it could crush armour and shields and had a point on it's reverse side to pierce even the heaviest of plate.
Cold steel make them. We still don't get one wtf?
Maybe the miliatary hammer should get a 2h mode or a new dedicated 2h model should be made. As for stats the war club isn't a bad place to start probably less reach and a secondary mode. Can weapons have 2 secondary modes 2h and pierce.(in regards to miliatary hammer)