The Apoca-Fist is a pair of oversized costume fists that cause the enemy to explode into a gory mess when the enemy is punched.
This weapon may be obtained in the mission "Murderbrawl XXXI"; towards the end of the mission, the player will be given the choice to either unmask Killbane and receive his mask, or spare him and receive the Apoca-Fist.
While wearing the Apoca-Fist, players are able to punch cars with the force of Oleg Kirrlov.
It was originally reported that the Apoca-Fist could be bought for $100,000, although this is not true, it is unlocked in the Unlockable Pack DLC.
The Apoca-Fist is Saints Row: The Third's version of the Pimp Slap from the first two games. It is an instant kill on normal enemies, it allows cars to be moved with a single hit but any more hits and the car explodes, and kills brutes in 3-4 hits.
As Killbane's mask cannot be obtained through cheats, it is recommended to pick Killbane's mask first and then use cheats to get the Apoca-Fist if the player wants both rewards.