I haven't read the series, but I just looked it up on RPG.net and it sounds like it fits very well in what the devs seem to be going for! I especially like how the "gods", in our case the channelers, are able to elevate mortals to godling status (the first of six levels), and then that former mortal has to ascend the ladder to become more powerful. I especially liked this line from the site:
"A recently-ascended mortal starts out as a godling. He can smite any lesser creature with ease, but given his limited amount of primal energy, even mortals could overwhelm him with sheer numbers..."
I think that channelers should be considered gods on a mortal realm, capable of shifting even the way the world works. And I also like the idea of gaining essence through worship or other similar means. I could also imagine creatures in the world, such as dragons, possessing large amounts of essence that are wildly uncontrollable based on their current disposition