Lytek is the god of Exaltation. Dealing mostly with Celestial Shards, he is responsible for preparing them for their next incarnation.
Due to the Usurpation, Lytek has lost most of his influence in Heaven due to the disappearance of the Solar Exalted. He is one of the most well-known allies of the Sidereal Gold Faction.
Lytek is the only god (besides the Maiden of Secrets) that is aware of the Great Curse. Dissolvegirl/GreatCurse has a nice list of reasons why they wouldn't have told anything to anybody.