: I find it unusual that Balor even recruited him, given
: that he (apparently) betrayed him when he was light.
: But I guess the 'keep your friends close, and your
: enemies closer' adage fits well there.
His betrayal was motivated by a lust for power...as the most powerful entity in the world, Balor could pretty well rely on Myrdred's loyalty. Plus the "bent him to his will" line suggests that a bit of brainwashing was involved.