Corrupted

Corrutped are evil creatures that kill needlessly and without remorse. It is the duty of the Lucid to dispose of the Corrupted.

Creation
According to Vishunei, corrupted animals are born when two creatures known to kill or outright destroy anything and everything in their path, come together and become mates. Corrupteds are born stronger then their siblings and are said to bite out the tongues of their younger siblings so that they get full resources to themselves. How much of this is true is unknown, since Hinto did not display any highly aggressive tendencies with his siblings, neither did Sion.

The muted phase
Vishunei says that corrupted go through a stage where they act normal. This is known as the muted phase. The term comes from the fact that the corrupted is unaware of it's true potential and as long as that remains, won't do harm unintentionally to their family. However, since they are normally carnivorous, they will kill and eat herbivores.

Final phase
If a corrupted becomes aware of their power, they will go into a power rage. In this rage, they will kill anything in their way, including family, friends and even members of the same species. However, the rage does not seem to be permanent, and the corrupted might even feel remorseful, as Vishunei mentions Marble attacking was out of loss of will to live, not hostility.

Powers and Ablities
Corrupted can shift their fur and feathers into sharp spikes, sharp enough to pierce through skin, flesh and internal organs. A good example of this ability is when Marble uses his ability in an attempt to shield himself from Huata's attack. Hinto also has this ability, as shown when it involuntarily activated and killed the elk attempting to charge at him. Corrupted also may have the ability to speak to other animals outside their species, but most of them refused to acknowledge this.

Corrupted animals
Here is a list of known Corrupted animals:

Marble: Marble was a corrupted cat. He had gone past the muted stage and was beyond reasoning with. He was killed in episode 13.

Mob of Crows: The Mob of Crows was a massive flock of corrupted crows. Like other corrupted, they were beyond reasoning with. Most, if not all of them, were killed in episode 20.

Sion: Sion was only seen during a flashback. Since she was still in her muted phase, she looked and acted normal. Sadly, she died during this flashback, protecting Hinto

Hinto: Hinto is Huata's mate. He is still in his muted phase, but seems to be slipping into the final phase. Still, he can still be reasoned with and despite his violent outbursts at times, is pretty normal and agreeable

Fanon Corrupted
Arkham (OC): Arkham is a corrupted bobcat OC. He is still in the muted phase, but acts much darker. He can be vicious and cunning, but is a joker and loves his family.