learning about the shadow race

Tora goes home and goes to his room just to be surprised by Levi sitting on his bed Tora asked Levi why she was in his room Levi said that she came to tell him about the shadows and all the different ranked shadows. Levi said the shadow you first fort was a beginner shadow then when they rank up they're apearenced changes into a bigger and stronger shadow called buffed shadow and after that they rank up to a mutated shadow called demie reapers that starts to look more like a human called after that they are able to weled swords like us death reapers called demie death reapers then there are captains we don't know if there is any other class but as an army the shadows are at the front line then buffed shadows then demie reapers then demie death reapers and then the captains.