Grimm

The Creatures of Grimm, or just Grimm, are monsters that inhabit Remnant. The Grimm were created by the God of Darkness. Currently, the Grimm are under the control of Salem.

Grimm are said to lack a soul, and thus lack the ability to use Aura. They are drawn to negativity

Named Grimm
Named Grimm are Grimm that have existed for so long that they have become enshrined in legend. They are old and powerful entities, and do not fit neatly into any certain Grimm species. Named Grimm seem to possess a high intelligence, as well as a modicum of sapience. While they are still influenced by negativity, Named Grimm are not drawn to it. It is speculated that this trait is one of the factors to their long existence.

The Four Gods
The Four Gods is the name of a group of four Named Grimm that are said to have been one of the first created by the God of Darkness. While their real ages are unknown, they can be estimated to be somewhere in the millions.