Drawn by me
Diamondhead's mutation affects the density and appearance of its crystal body. The crystal's density is increased many fold, making them much darker than they normally would appear, closer to a coal in color than crystal. The crystals are so dense, that light and energy is absorbed by the crystals, instead of reflected and make the more organic crystal of its fellow Petrosapiens look like glass in comparison, able to deliver and receive damage that would kill them easily. However, at the cost of this indestructibility is the lose of their normal adaptability. The crystals are so dense they cannot be grown and launched. They are also unable to regrow lost limbs or repair damage in the unlikely event they find themselves injured.