This school of magic allows past events to be changed to mesh with current needs. It is theorized that only the Titans have access to the powers of Retconjuration as it is too powerful for a mere mortal to comprehend even the smallest ramifications. Being a very volatile subject, it is usually avoided in most public forums and viewpoints on the subject differ greatly.
The school of retconjuration is notable for being an example of itself; the Numbers axis of Naughtymancy was an entirely different school called "Deletionism" until the Titans realized that Retconjuration would be necessary for them to properly maintain Erfworld.
The name refers to "retcon", short for "retroactive continuity", in which the history of a fictional setting is be changed after publishing to mesh better with the current desires of the author.