Celestial Obedience / Boons for other Empyreal Lords

[Unclejunzo]

Is there anywhere I could find obediences/boons for the Empyreal Lords who didn't receive a full write up in Chronicles of the Righteous? I have a player who is interested in being a mystery cultist of Keltheald, but I'm at a loss for what his obedience/boons would look like.

[Master of the Dark Triad]

Yeah, I was wondering the same thing for both celestial and demonic boons. Where can these be found?