Heavy Morningstar (3.5e Equipment)
From D&D Wiki
Like it's smaller morningstar cousin, the heavy norningstar is a long shaft with a solid metal orb fixed to the top, covered in sharp protrusions. The heavy norningstar typically has some sort of large pommel on the opposite end to help counter the immense offset weight, however because of the imbalance it can not be considered a Double-Weapon. Rather, the spiked protrusions and the vast weight behind it make the weapon ideal for disarming opponents.
When striking an opponent's weapon, the spikes effectively "lock" the weapon in place, while the weight drags the weapon aside. Because of this, the heavy morningstar grants a +2 circumstance bonus to disarm attempts.