Chainsaw (Doom 2016)

The chainsaw returns in the reboot of Doom as a brutal melee weapon, now for the first time featuring the ability to completely dismember, decapitate, and cut directly through enemies. It features a dramatic appearance with a sharp, blade-like metallic chain guard, has a chain studded with savage razors, and harkens back to the original design with a bright yellow coloration. It is a forbidden black market item at the UAC Mars Base due to its lack of practical uses on Mars and an apparent attraction it possesses to people intending to do sadistic damage. As such, it was subject to confiscation by UAC security before the facility was invaded by the forces of Hell.

Tactical analysis
The chainsaw is a quick-kill weapon, capable of destroying powerful enemies like the Hell knight and cyber-mancubus in a single well-placed hit. The weapon is, for the first time, realistically limited by using fuel as ammunition, in order to balance its lethality and to provide a mechanic to encourage its use. Killing enemies with the chainsaw causes a massive drop of ammunition for other weapons, making it a key way to restock supplies. Most and occasionally all of the fuel supply will be used up, depending on the enemy being killed.

Pre-release behaviors
An apparently incompletely coded ammo counter appeared on the HUD during the demonstration which displayed a static number 6 while the super chainsaw was in use. It was speculated variously that this was meant to eventually serve as the maximum number of uses of the weapon altogether (before it would ostensibly run out of fuel, for example), or the maximum number of glory kills that the weapon could perform before it reverted to a less powerful form. It was also invariably referred to on the HUD as the "super chainsaw." This is replaced by an actual functional fuel gauge in the final released version of the game.