The Megaverse Builder is a 96-page reference book for Rifts and Phase World that allows GMs to create their own dimensions. The book includes an expanded Shifter O.C.C. and new classes - the Tolkeen Artifact Hunter and the Scavenger.

- 20 pages of rules for creating your own dimension.
- New monsters such as the Cerebellus Demon, Avian Biomech and the Splynn Lizard.
- New dimensions, including the Dimension of Spires, the Great Machine and the Garbage Pit dimension.
- Information on existing dimensions including Wormwood, Heroes Unlimited and Palladium Fantasy.