Purgatory is a fantasy fabricated from 1438, for further empowerment of a nicolaitanized religion. The Christian, as a member of The Bride, will have a 'review' in Heaven, which will purify. This is related to the 'cleansing bath' the Jewish maiden has before the wedding ceremony. You can get as much purging from catholic purgatory as Luke Skywalker got from the force, and at about the same level of fantasy.
The heresy of catholic purgatory stems from the denial that Christ's blood cleanses from all unrighteousness and then God immediately sends His Holy Spirit Life into the cleansed believer. This is a subtle way to deny the power in the perfect blood of Christ Jesus. It is also a way the system of catholic church empowers their bureaucracy, not a furtherance of salvation ministry.
“Purgatory is a fantasy fabricated from 1438...”
Nope. As I just posted to you there is no reason to pray for the dead if there is no Purgatory.
Also, off the top of my head, why are you making up this date of 1438 when I have read documents from the 11th and 12th century about Purgatory? Even the skeptic Jacques Le Goff insisted that Purgatory was discussed widely in the 12th century.
And, of course, you’ve never even seen this book, right?
https://books.google.com/books?id=Fw1cAAAAQAAJ&pg=PAPP5#v=onepage&q&f=false
And, still, prayers from the dead show that people believed in Purgatory long, long, long before the Middle Ages.