Active item icon image.
|The following is based on Van Buren and has not been confirmed by canon sources.|
The power fist is a weapon that was to appear in Van Buren, the canceled Fallout 3 by Black Isle Studios. It also featured in the Van Buren tech demo game files.
It is assumed that it would've functioned in a manner similar to the "big frigger" seen in previous Fallout incarnations, including using small energy cells as ammunition.
While it doesn't appear in the Van Buren tech demo, it is still present in the game files as icon images but cannot be spawned.