Warmonger

 is a perk added to Fallout 3 with the Broken Steel DLC.

With this perk, all custom weapon types become available to you without the schematics. Taking this perk immediately gives you the level 3 schematics for all weapon types. This perk can either be extremely useful or a complete waste, it is useful if you have missed your chance to get some of schematics (Herbert Dashwood killed, Doc Hoff killed, etc...).