Make it up !!
Alll these gods really suck
imho... except Shar she looked good in
3e
to be honest, you're asking about flavor in an edition that decided to supress it because of too many complaints. You're going to have to wait a while before reaching full satisfaction.
You only options are: either reach into the old material (find a copy of faith and pantheons
3e for example)
or
research the net for alternative info about them
or really best of all, invent your god's history and the interactions between your gods or just really invent new gods ^^
peace