/ war hammer can be crafted with the following recipes

Player Recipe
Primary skill used: fabrication(7)
Required skills: N/A
Time to complete: 480 minutes
Tools required:
> 1 tool with chiseling quality of 3
> 1 tool with anvil quality of 3
> 1 tool with hammering quality of 3
> swage and die set
> electric forge (160 charges) OR acetylene torch (160 charges) OR charcoal forge (160 charges)
> pair of metal tongs
Components required:
> 24x scrap metal
> 1x plank OR 2x heavy stick
> 2x lump of steel OR 8x chunk of steel OR 40x scrap metal
Byproducts:
(none)
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This recipe can be found in the following books when fabrication is at least the required level:
The Historic Weaponsmith (level 8)
The Streetfighter's Sidekick (level 6)