kandykidzero asked: On Crucible of the Spirit Dragon, there seems to be structures similar to the Hedrons used on Zendikar in the art. I thought Nahiri was the one that created the Hedrons to imprison the Eldrazi, so how could they also be on Tarkir?

Hedrons on Tarkir?! Apparently so. We will learn the reason for this soon.

Personally, I recommend you go to your local Fate Reforged prerelease and continue to follow the story in Uncharted Realms.

http://magic.wizards.com/en/events/event-types/prerelease

http://magic.wizards.com/en/articles/columns/uncharted-realms