A "pristine realm" is a term used by Image:Blizz.gif J. Allen Brack in a blue post on April 25, 2016 posted Image:Blizz.gif Nethaera that discussed how the issue of a retro or vanilla realms within the company (not speaking to emulated or private servers directly) written by J. Allen Brack. Here is an excerpt from the blue post that discusses it: