The Weapon that games forgot.

 The Poleaxe

The Poleaxe... Awesome!

These things rock and are missed out of AD&D 2nd Edition (The one and true edition). They were the most common weapon of nobility in later medieval Europe and they are totally underrated. 

It's characteristics are thus. They are about five to six feet long, have a large spike at the end and a shorter spike at the butt of the pole. They have a hammer one side and an axe or bill on the other. In combat you would use them to hook, smash, stab and generally batter. Armoured men on foot would smash at their opponents armour until the sliding rivets stopped working, the plates got bent and the man in the armour essentially seized up, then they would get them onto the floor to finish them off. 

Of course they could get lucky and land a sound head shot that would crush the skull inside the helmet or just render them totally senseless. 

Against lightly armoured people they are amazing. You can keep adversaries away due to the length of the weapon, and hammers in general are nasty! They do a lot of damage. The Poleaxe was like the swiss-army knife of medieval weapons, but whereas a Swiss army knife is a bit crap at anything because they try to do too much, the poleaxe was just brilliant. 

In terms of AD&D 2nd Edition, the Lucern Hammer is the closest, I guess but the Lucern hammer is not really the correct term, Poleaxe is the correct, generic name and covers all the variants. I don't think the stats do them justice, but you have to work within the limitations of the game, everyone would have one if it was too perfect, in the middle ages though, most people did have them, They were that good.