FourthBear
First Post
For the purposes of illustrating the conflicts of evil versus evil and bringing the PCs into the middle of an ancient cosmic war between implacable foes, I think that there will be plenty of scope in the new default cosmology for that. Given the description of the Elemental Chaos and the hordes of demons, just create an endless conflict between two sets of demons within the realms. They can have all the mortal recruitment, implacable hatred and alien nature as the Blood War. And given the fact that demons are no longer epitomes of CE, you can make one group of demons rigid and organized and the other an unruly mob, if you want to illustrate that kind of conflict as well. You could also use well established Evil vs. Evil conflicts such as githyanki vs illithid. And, of course, you could just toss out the default cosmology and just use the Great Wheel.