Lucerne Hammer (4e Equipment)
From D&D Wiki
Military Melee Weapons
The Lucerne hammer is a type of polearm with a three pronged hammer, a spiked tip, and a curved pick-like spike. When swung it is effective at puncturing or smashing armor and could be used for dismounting riders.
The Lucerne hammer deals more damage when you score a critical hit with it. A critical hit deals maximum weapon damage and an extra 1d8 at 1st–10th levels, an extra 2d8 at 11th–20th levels, and an extra 3d8 at 21st–30th levels.
You can attack enemies that are 2 squares away from you as well as adjacent enemies, with no attack penalty. You can still make opportunity attacks only against adjacent enemies. Likewise, you can flank only an adjacent enemy.
The Lucerne hammer can be used to make a dismount attack.