|“|| In the beginning we lived as thieves,|
Stealing fur and fang of beasts for survival
|— The Hammer Book of Tenets|
The Master Builder (aka "The Builder" or just "Builder"), is the principal deity of the Order of the Hammer, and its offshoot, The Mechanists (The exception being that towards the end, Karras was considered, and considered himself, almost to be above that of the Builder). He is the god of order and innovation and is the opposing force against the Trickster, the god of nature and chaos. According to Order's beliefs, the Builder taught people to use the hammer and other tools so that they could protect themselves from dangerous natural environment and use technology to develop their civilization. Based on his deeds and assertions, a Book of Hammer was written, being the main compendium of laws and rules for the Hammerite Order. To the Hammerites, the most blessed symbol of the Builder is the Hammer.
The Builder's doctrine tells that the nature should be oppressed and used as a resource for creating material benefits, such as advancing civilization or the building of factories and other buildings. Blind following to this doctrine may be dangerous as it may end up in destroying the whole nature including the mankind itself. That was proven by Karras, who tried to destroy all biological life, seeking the Builder's favor.