User blog comment:Hidden Scorpius XI/Another problem with Vol. 2 (In my opinion)./@comment-10380701-20150522232017/@comment-26018514-20150524035652

agreed Zolnir, personally I feel grimm are more like a mix between the Aliens(from the series Alien), and the X(from the Metroid Series).

It tried to evolve/adapt by copying other life forms, but cannot replicate aura. because of this, it is constantly evolving and cannot choose a single form, instead forming various "types" based on what it encounters.