Who exactly are the Sons of the Crystal Mind and if that is what the book is called why aren’t they on the cover? Well, the Sons are an insane cult who worship the Basis, which is the part of Diamond City that enables you to grow whatever you want (clothes, food, flying bikes, even people)… out of the floor. So it’s pretty cool. Is it a god though? Hmm… The Sons of the Crystal Mind look like the guys in the photo although without the trees as Diamond City is 50km underground. While striking, they’re not as hot as Ursula.