Wyan is one of the 13th Champions of Rajaat, named: Pixie Blight.
He was successful in wiping out off the tree loving pixies by destroying their trees.
When the other champions rebelled against Rajaat, Sacha and Wyan stayed loyal. After Incarcerating Rajaat they were both present when Borys transformed into a dragon. The process destroyed their bodies, but their heads lived on.
Kalak collected them and used them to infuse his templars with spells. Kalak had never undergone the process of becoming a Champion (false) and he convinced Sacha and Wyan to lend his templars their spells.
Later on they would advice and teach Tithian in the way and dragon magic.