From publisher blurb:
Previous Editions to Fifth Edition
Are you a fan of older edition materials? Are you a writer, developer, or publisher with a need to convert older edition monsters to Fifth Edition? This conversion guide will walk you through the process of creating a simple, first-pass conversion. Mastering this process can save you hours in the long run, letting you focus on thematics, not basic numbers. Retro Monster School offers guidelines for 1E to 4E, as well as Pathfinder 1E. Take note: this is a formidable tome, created by an expert of the craft to guide others seeking an in-depth guide to the art, science, and best practices of converting older edition monsters.