Tsair was once an adventurer, who traveled across the world in seek of danger. He once battled a menacing demon, who cursed him. The demon's curse printed powerful runes upon his flesh, and transformed him into one of the cursed. Tsar was able to draw power from these runes on his body, but at a cost. If he tried to draw too much power from the runes in a certain amount of time, he could become a demon himself. This only happened once, and it caused all of his hair fall from his scalp, and it was replaced by two black ram's horns. He left on a journey to find an slay the demon that cursed him, but he never returned.

Sorry for that crappy story, I just came up with that on the spot about 5 minutes ago.