One hundred years after a plane is destroyed, a society is built by the remnants who could escape in time. Only seven sentient races escaped, and the continent they find themselves on is wild and inhospitable. Divine magic seems to not work in this new realm, with no explanation.
When a society of elves attempted to summon an unknown object, in their hubris they attempted too great a feat, and to summon it they weakened the threads that held their plane. They had doomed the creatures living there to a few years of life before the planes dissolved. Seven races, humans, Kenku, Tieflings, Deva, minotaurs, Satyrs, and Gnolls, banded together to create a portal to another, new plane upon which they could live. To channel it required the entirety of their divine magicks. All other creatures were precluded from entry of the portal.