Chainsaw

The chainsaw is a melee-based weapon that has appeared in every Doom title in the series. This weapon mutilates enemies close enough to contact. At 525 hits per minute, it is roughly a quadruple-speed fist. It is often used because it conserves ammo, its "rapid fire" works well on enemies with high pain chance, which minimizes damage in melee situations, and because of its gory implications.