One of the core principles of Eberron is that you should make it your own. People often say “If it’s in D&D it’s in Eberron,” but the actual quote is “If it’s in D&D it has a place in Eberron” – it’s up to you if you want to put it there. You don’t HAVE to use abeil in Eberron. But if you want to, it’s a simple matter to add a lost city of bee-people in Xen’drik, to make them the Mourning-warped inhabitants of a Cyran city, or the latest creations of Mordain the Fleshweaver. It’s up to you to decide if the Sovereigns still exist or if divine magic is another form of sorcery. You decide the cause of the Mourning. And so on.
Setting aside the facts of the setting, there’s the matter of system. I know people who run Eberron with Savage Worlds and GURPS. I myself occasionally use the Over The Edge rules. I just heard about people playing it with Dungeon World.
I’d love to hear what you’re doing with the setting. Are you using it as is? Stripping pieces out for a homebrew or mashup of other published worlds? What system are you using?
And as always, if you’d like to suggest a subject for a future Dragonmark post, feel free to add it in the comments! And if you want to keep track of my other posts, I’m on Twitter as HellcowKeith and G+ as Onesmallkeith.