Its a riot control shield, so its got a bunch of tazer style electrode points on the front of the shield. Whether or not that has an effect in game is up to Azarael, I just wanted to make it look a bit more interesting.
To be honest I have no particular ideas on how it should be implemented. Shield + hammer bash could be primary with held shield + hammer bash for secondary is just as possible. Can even have a deployed mode where you jam it into the ground (has some big ass spikes on the bottom) for use as either free standing cover or a shield wall type stance that gives you defensive buffs at the cost of mobility. I even added some animations where he holds the hammer against a conducting plate for some sort of area attack, or maybe a sustained melee fire.
Its pretty open for suggestion as far as implementation goes.