"After assembling the body out of various junk, he binds to it an elemental spirit, which lends the construct

"After assembling the body out of various junk, he binds to it an elemental spirit, which lends the construct a semblance of life. In some golems, this enslaved spirit may go out of control and become berserk. However, the mage assured me that he has been able to completely eradicate this flaw. All he needs now is your permission – and access to our rubbish heaps."