The Ozar

Background
The Ozar are creatures coming from Ozar—"whatever world it is that the Veil covered. "

Once across the Veil, in Daljyr, they are trapped: they don't enter the Dream and, whatever life they lived before, they no longer live. "

Ozar can carry the Plague, but they are much like people who have survived the Plague: they are also immune to it. That is part of where the fear and stigma of the Ozar comes from—not just that some of them are literal monsters that will eat you. "Even the ones that are not, even the ones that are humanlike or could be more human, could be carriers of the Plague and so there is a lot of those fears and those beliefs that they may be spreading that into the city."

Pepper
Pepper is the first Ozar we meet.

The Grimm Dire
Even though very little is still know about it besides the fact that the House of Broken Glass gave the Quiet Echoes plenty of coin and plenty of knowledge to release it in Five Irons, the Grimm Dire was probably from Ozar before the House of Broken Glass captured it and did something to it to run experiments—maybe they corrupted whatever it was before. The Professor, followed by Pretty Baby, starts tracking it after finding a mauled body and a tooth. This beast first manifests to the Professor as two large glowing yellow eyes looking at the Professor; then these eyes disappear and then they reappear in from of him. This large creature could best be described as a dog or a wolf; it is a large canine—as tall as the Professor—; its haunches are massive; its mouth is hanging open; its breath is hot in his face as these bright yellow eyes stare down at him and it lets out this low growling noise; there is a deep resonance from inside of it as it is going to take a bite out of him. After the Professor successfully tames it and Pretty Baby puts a leash on it, they lead it towards the Edge Lands. As the sun crests above the horizon and the beautiful reds of the sunrise appear, the professor looks at the dog, it seems almost translucent; and as the sun gets brighter and brighter, it fades completely from view and disappears, and the ropes that served as a leash falls to the ground. The Professor immediately traces it from memory in his notebook.

This creature could be a dire wolf, except for its disappearing tracks: the ability to teleport or maybe go insubstantial—at any rate, to move without leaving any trail behind—tracks better with what the Professor knows about Grimm, but this creature in particular is displaying a a behavior that is contradictory with this latter hypothesis, so that in the end, the Professor is "able to identify both that this creature is two possible things and neither of those things."

Luna
Luna, Pretty Baby's companion usually described as a moth, is an Ozar.