Multiplicity and Synthesis dives deep into the technological and social implications of both forking—the practice of copying your mind—and group minds composed of multiple egos. This supplement is essential for thinking about character concepts who aren't limited to a single mind. It includes optional merging rules, new mental ware, a new async sub-strain (the Swarm), and new sleights.
Multiplicity and Synthesis is a 14-page Eclipse Phase sourcebook with 3 pages of *Eclipse Phase Second Edition* rules + GM-specific advice.