Brimaz is the Leonin king of Oreskos- a rocky river valley in a remote region of Theros. Tethmos is the primary leonin den, high in the mountains. Leonin are a form of anthropomorphic lion found on multiple planes. They have a strong connection to white mana.
Mirrodin Leonin
The Leonin of Mirrodin dwelled in the Razor Fields, their capital being Taj-Nar, the Ancient Den. Their culture is highly honor-based and religious, worshipping the white sun. Clerics of the suns have to survive a year in the Razor Fields before they are regarded as full "abuna"s that are allowed to lead other Leonin in religious ceremonies, particulary the Sunroar. As with all creatures from Mirrodin, they have partially metallic features. The Leonin shared a bond with the pterons, flying reptiles, and specialized skyhunters used them as mounts.
After Memnarch was defeated and Karn, Mirrodin's creator, sent those leonin abducted from other planes back to where they had come from, a schism ran through the remaining ones. One group supported a new kha named Kemba, calling themselves the kha-tal. The other, formerly the Obu-tal, called for revolution against the old societal structures, believing that they did not apply to the changed world.
Like all inhabitants of Mirrodin, the leonin were drawn to that world from another plane. Though never explicitly stated, it is possible that they came from Alara; both the nacatl and the leonin call their leader the kha, and after Alara reformed, some Nacatl began calling themselves Leonin.
Nacatl
The nacatl are a race of leonin from the shard of Naya (originally part of Alara). The males look very similar to the leonin of Mirrodin (sans metal plating) and have light fur, while the females lack manes. Naya's leonin display a bit more physiological variety than Mirrodin's leonin; Nacatl have coats like tigers, jaguars, ocelots, etc., whereas Mirrodin leonin tend to stick with a more strict lion look.
The cat-people used to dominate Naya, but a rebellious faction led by Marisi believed they had grown weak, and that they should return to their true cat-nature. Their empire crumbled and the nacatl were reduced to isolated tribes. By the time of the Conflux, the nacatl were split into at least two cultural groups: the peaceful Cloud Nacatl, who inhabited the mountain ruins of their ancestors, and the violent Wild Nacatl or Claws of Marisi, who lived in the lowland jungles; the two groups had nothing but contempt for each other. Scratchforms is the writing system employed by the nacatl. Among Wild Nacatl scratchforms are predominantly used by shamans. The most important text set in scratchforms was the Coil.
The savage nacatl are a subgroup of which very little is known, save that they disdain the use of weapons and armor. Savage nacatl are larger and more muscular than other cat-people, with no manes, gray fur, and black tiger-like stripes. Their relation to other nacatl is unknown.
After the Conflux, when Alara was made whole once more, some nacatl migrated to the civilized lands of Bant and began integrating into the city-dwelling culture. The Bant cat-people, who adapted to the chivalrous code of knights and soldiers, simply called themselves leonin. The Nayan pride of the Sunstrikers is loyal to Ajani. It's their sworn duty to keep his lands safe.
Nacatl means 'Meat' in Nahuatl, which is a Mesoamerican language notably used by the Aztecs.
Theros Leonin
Unlike the proud leonin of other planes, Theros' leonin are disgraced outcasts due to their previous support of the Archon Agnomakhos, who tyrannised Meletis and surrounding lands. These leonin make a conscious effort to seperate themselves from humanity and the other races, down to not worshipping the main gods of Theros, though some do still occasionally honor Heliod and Nylea.
Nishoba
Ogre-sized cat-people blending the features of snow leopards and smilodons, nishobas lived as marauders in cold regions. Nishobas are known to have lived in Terisiare and Otaria, but may have become extinct after the end of the Phyrexian Invasion of Dominaria.
Rakshasa.
Endemic to Tarkir, these anthropomorphic cats are also demons. Tiger-like in appearance, they are associated with the Sultai Brood, the members of the brood having made demonic contracts with them to gain power. The wield potent dark magic that makes them feared. A single Rakshasa can lay waste to swaths of land or reduce an army to dust. They summon horrors and abominations that swallow cities and devour legions.
In the past, Tasigur, khan of the Sultai, offended the rakshasa, who withdrew their support from him. Having been left vulnerable to the renewed dragon attacks, Tasigur made a pact with Silumgar, leading him to a meeting with the other khans. Afterwards, the rakshasa renewed their pacts, but this time with Silumgar. The dragonlord fears that the rakshasa will eventually turn against him, but knows that their magic is too useful for him.
