One major notable thing about Leareth is the fact that he looks like the identical but color swap to Vanyel, Pitch black hair to Vanyel's silver-white hair, eyes of ebony to Van's silver, and his clothes cut similar to Herald's Whites, but all black instead. Even their heights were identical. This is quite important to note since Van stands for the Heralds and Leareth stands for the darkness that threatens them.
Van has a dream of the battle he would have with the mage several times in the Trilogy. The first one is mentioned in Magic's Pawn, causing Vanyel to panic and try to escape his fate as a Herald-Mage. Years later, into the third book, Magic's Price, the first time Vanyel sleeps with Stefen he discovers the dream didn't fully leave him, even though he destroyed the mage Krebain. This time it changed at the beginning, the only identical part being the words "I am Leareth" from the figure looking like Vanyel.