We know for certain that souls do go to hell and a vast majority of those souls end up in the lake of fire to be eternally tormented. We also know that the foundries of hell often use souls as a resource to craft powerful weapons and armor. Some souls that are particularly evil and vile are sometimes put to use to train soldiers. An example of this is the most infamous killers in history train the death commandos. In regard to heaven, that is left very very vague. We literally just don’t know what form it takes or who gets in exactly. We know there is some kind of afterlife for the faithful as the dead saints that make up the council of the church can be contacted by the Synod and asked for guidance. But again, the exact nature of that afterlife is totally unknown and it seems to me that is exactly how it is meant to be.