[spoiler discussion] Od Laguna and souls question
I don't really get how the filtering process of od laguna works. As far as I know, when someone dies, their soul goes to od laguna and there the memories are removed, they become books of the dead and the soul is now empty. If that's the case how is there a Typhon book of the dead? Wasn't her soul collected by Echidna? We see Typhon still having all her memories in the castle of dreams so her soul shouldn't have gone through the whole filtering process and a book of the dead shouldn't be there right? How can there be both a book of the dead and her soul still having its memories intact? Also how does the sacrament of the immortal king work? Lets say someone like Lamia has died. Many years after her death, her soul is used to revive her as a zombie and she has her memories intact. How is that possible? Shouldn't her soul have been filtered by now and be empty?