Basara

A Basara (婆娑羅バサラ) is an evolved and a humanoid Impurity that has absorbed the powers from Exorcists by killing them. When they absorbed enough, they turn into a Basara regaining a human form and the human speech. Their ranking is based of their time of birth. The smaller the number, the older and stronger they are. There are eleven (eighteen in the anime) Basara known, and each is powerful enough to challenge a Guardian and kill a mass of Impurities.

Appearance
Basara look a lot like human, but they still retain characteristics that distinguish them from humans. They have a dark skin color and the kuji-kiri on their torsos. Furthermore one eye will turn into an eye of a normal human, while the other will turn black, with a red pupil, and have cracks around it.However if a basara absorbs more power, the basara will look like more human as demonstrated by Kuranashi when he removed his mask, revealing his face with normal eyes which is very different from other basaras.

Human Speech
After turning into a Basara they regain the human language and are able to use it without problems. They will communicate with other Basara to plan something or with Exorcists to make them feel more despair or ridicule them.

Enchanted Gear
Due to the absorbing from the different powers from the Exorcists they are able to use the Enchanted Gears as well, by using the curse talisman.

Regeneration
Basaras such as Kamui seem to be able to regenerate their body parts after getting severed or damaged.

Immense Strength
Different Basaras have shown on numerous occasions to possess a high degree of strength. When battling exorcists, they are able to defend themselves by hitting their opponents without putting much effort into it.

Enhanced Reflexes
Basaras, such as Chijiwa and Momochi, had proven themselves to be able to dodge from their opponents' attack.