1 higher nucleus = 10 medium nuclei = 100 lower nuclei.

The grade of crystal nuclei is divided into: white crystal nuclei

Blue crystal core

Cyan crystal core

Green crystal core

Yellow crystal nucleus

Orange crystal core

Red crystal core

Brown crystal core

Purple crystal core

Black Crystal Nucleus (PS: Crystal Nuclei produce from the initial level 1 white crystal nucleus, to the last level 10 ultra-rare black crystal nuclei. These are all obtained by evolutionaries from the brain of every mutant zombie or mutant beast, which can also be called 'brain nuclei' in the most traditional way! Evolutionaries can absorb the energy in the crystal nucleus quantitatively, so as to get a deeper level of evolution themselves! ）