Use your imagination. It's a robot.
The Baevern are a race of beaver-like beings who vanished from the world during the Shattering. They resemble giant beavers that became as tall as dwarfs upon reaching maturity. They possess a unique connection to the element of wood and are known to use it in every aspect of their culture. They even have a technique for making wooden armor as durable as steel, but the exact details have been lost to time.
Lightbringers are Paladins in service to the dogma of Istensia, led by one of the White Mantles of the order - Cassandra du Soleil.
They aim to wipe out necromancy and the undead. The motives of each individual may differ - some may do this out of pity for those risen in undeath, while others may vehemently despise these creatures and only wish to slay them to eradicate them from Orn. Whichever the case, they command the light of the Prime to slay their enemies and heal their allies.
Cassandra du Soleil, white mantel, leader of the Lightbringers, and most importantly - First of Istensia.
Cassandra is a human who has existed since before the Shattering, and once led the charge against the avatar of Etejeril. Shortly before the Shattering, Istensia entered the body of Cassandra to prevent being destroyed during the cataclysmic event. This changed Cassandra, warping her perspective of human events and morality - leading her to twist the dogma of her immortal just enough to allow for radical, immoral actions to be taken in their fight against necromancy.
An artist unfairly punished for his depiction of a particularly bloody battle. In retaliation, his daughter was taken and brutally murdered, with the statement "DEATH IS NOT ART" written in her blood on the nearby wall. In a desperate attempt to bring her back, he delved into the dark arts of necromancy. His passion and overwhelming drive to accomplish this goal twisted his mind, and the more he immersed himself within these magics of the Nether, the more insane he became.