Riftspacers

After Sylline's fall, the world collapsed. Many wonderful species became extinct and the atmosphere outside Shields became unbreathable for many beings and mainly plants. But still, some creatures are able to live and breathe in this broken world.

Riftspacers are considered as the colonialists of the Sickspace, the world outside the Shields. They may seem small and for some, they are nothing but nuisance for the world, but it's always better not to underestimate these insidious beasts. Not just that they are carnivore and often live with very socialized packs, but on top of that, they, such as many others of Sickspace, possess special abilities.

Appearance
Imagine a cat. Black and white cat, maybe with some grey tones. Good, so you can imagine the size and the color of this animal. Some varieties are even bigger, but the maximal natural size ever seen isn't bigger than lynxes. But even though they are similiar to ordinary cats, they are far more interesting. Truth is, their appearance varies a lot; sometimes they have one eye, sometimes three, sometimes even five of them. Multiplied amount of ears isn't excluded, too.

But let's focus on general signs of Riftspacers.

Usually, they have big black eyes, whose number varies a lot, but it's usually between one and five.

Their noses are tiny and mouths are unnoticable under their white fur.

Usually, they have large/multiple ears, with black fur inside of them. Next to the ears there are usually horns, whose style varies a lot, too.

Usually, they walk on four legs, but sometimes there are some extras or some are missing. Some Riftspacers were also seen with wings.

They tend to have long tail with a lot of fur on the top, but that's not a rule.

On Riftspacers' white fur are many times various symbols and ornaments, similar to human tattoos, which represent their personality and abilities to other Riftspacers.

Abilities
There's a reason why are Riftspacers secretly called "cat thieves". I guess we've already talked about the cat part few rows above, so let's explain the thief part.

Riftspacers are able to create portals, rifts through space, universes and dimensions, which makes them able to unseenly take anything possible and then vanish without being noticed by any way. And they do not take only nice items they find; they are even able to take human being, port them to their world, let the human suffocate due the lack of his usual dose of oxygen and then feast on the dead body.

But not only that. They also possess the abilities of transformation - they can either make themselves a bit bigger (usually to the size of any large feline animal), or they are able to consume a being of their size and then take on a form of it, freely able to retransform back to their own form later on. This process makes the item/being that is consumed by them not restorable.