Hello. This is the thread lokii and I will use to work on assembling a new SR/ED FAQ. Contributions are welcome.
UPDATE on Tue, 07/05/2016:
I've compiled everything from this thread so far as follows:
The Basics
What is Earthdawn?
What is the Cycle of Magic?
So what’s the history of Earthdawn, in a nutshell?
What’s the connection between the Shadowrun and Earthdawn campaign settings?
Is the crossover still relevant, and why is it controversial?
Earthdawn Setting and Concepts
What is the province of Barsaive?
What is the Theran Empire?
What is the Kingdom of Throal?
What are the Elven Nations?
What are the Horrors?
What are the Invae?
What are Dragonkin?
What are Kaers?
Specifics
What canon Shadowrun products contain references to Earthdawn?
Which characters from Earthdawn lived long enough to make it into the Shadowrun setting?
Are there in organizations in the Sixth World that have ties back to the Fourth World?
Are there any major magical artifacts or cultural remnants from Earthdawn that survived to be discovered in Shadowrun?
Are the Horrors still a threat in Shadowrun? Are any of them active in the Sixth World?
Are the Shedim and Insect Spirits actually Horrors? What about Wraiths?
What are the dates for the Fourth, Fifth, and Sixth Worlds on the Mayan Calendar?
What about the First, Second, and Third Worlds?
How does the history of Earthdawn line up with real world history?
How does magic differ from the Fourth World to the Sixth World?
Why did the mana level stabilize in Earthdawn?
What is a locus and where does it come from?
What are the Rites of Protection and Passage?
What is the Blood Wood? And what was the Ritual of Thorns?
What is the fate of the White Tree?
What is the compact between dragons and elves?
What happened with the drakes?
Are there any other RPGs besides Earthdawn that are connected to Shadowrun? [Equinox, Eclipse Phase]
Haven't there been other efforts to compile Earthdawn-to-Shadowrun crossover info before this?