Acria The One World 5th Edition Setting

In Acria, there is no difference between the realms. And that is one of the biggest dangers when the 5e cosmology exists in one and the same place. In the far north, the Nine Hells and the Abyss exist as one entity where the Devils try to hold back the endless tide of Demons that seek to consume the countless worlds. In 500 SF, the last major demonic invasion occurred. A 5 century event known as the Long Night, a seemingly endless winter occurred as the Demons, after tearing through the Devils, invaded the world of Acria.   With guidance from the remnant Eternals and living gods alike, mortal kind beat back the demons. But the threat has never disappeared. Now, in 1500 Since the Fall, the demons approach once again and with crises across the world, will they be able to once again stand against the darkness? In this 5th Edition world, anything could happen, whether the greatest victories or the worst defeats.