I just realized that every faction mechanic is centered on being creature specific. I don't necessarily believe that's a bad thing, but my understanding is that the strong theme is supposed to be the lost technology of ages past, the artifacts. That in mind, I might suggest that what we do for Bellenar be based on artifacts, or some other mechanic be reworked to focus more on them. Right now the closest we've got is "plunder" which works for any card that's pulled off the top of the deck. 

Edit: Also do we know what types of creatures, sentient and otherwise, are involved in this plane? I see mention that dragons aren't a thing here, but I don't see a discussion here or in the Titan pad. I mean, unless that happened in the history of the pad's chat, or Skype.