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The philosophy of the Crafters is muscles.
The guild's also a gathering of weapon makers and engineers. They maintain a special standing in the app war and their territory is supposed to be a neutral ground. This is because they create weapons and perform maintenance on Sacred Artifacts for all guilds preventing them from being attacked as the attacker will also lose their services.
It should also be noted that aside from Tvastar, all members have some kind of prosthetic applied to them (Kurogane's arm, Amatsumara's eye, Takemaru's neck, Hephaestus' legs). It is implied however that given the markings on Takemaru and Kurogane, Tvastar's hands may be his prosthetic.