Merlin is a tiefling with deep crimson skin and long, sweeping horns that curve back like those of a mountain ram. He wears a suit of brilliantly polished silver plate mail etched with motifs of galloping horses. His eyes glow with a soft gold light, and he carries himself with the stiff, formal posture of a high courtier.

Merlin is deeply devoted to the concept of the knight-errant, treating every interaction with formal politeness. He is obsessed with horses and equestrian culture, often feeling more at home in a stable than in a city. Despite his hellish bloodline, he believes that true nobility is a matter of action and adherence to the chivalric code.

Merlin was born to the noble House Valerius, a family long famed as the royal masters of the cavalry. Though his infernal heritage was a surprise, his parents raised him with the expectation of perfection. He became obsessed with the ancient legend of the Centaur Knights, legendary warriors who were one with their mounts. This obsession led him to develop a specialized fighting style and a rigid discipline meant to prove that a tiefling could be the most noble rider in the realm. Merlin took his Oath of Devotion as a way to formalize his dedication to protecting the weak and maintaining the dignity of his station. He views his travels as a series of tests to prove his worthiness to both his family and the gods of light. Currently, he seeks to bridge the gap between his hellish appearance and his celestial aspirations by serving as a beacon of justice in the borderlands.