From the introduction: Volume One of the Three-Volume Multiverser rules set. This volume contains all the basic mechanics used during play for character creation, event resolution, and general conduct of the game. Volume Two, Multiverser Skills System, is necessary to provide bias information required for the use of skills during play. Volume Three, Multiverser Universes, provides information needed for the design and use of worlds during play, including the application of bias to worlds, the relationships between different kinds of worlds, and movement between worlds. User summary: This incomplete, draft document presents the initial development efforts for the "Core Mechanics" of the planned, but unpublished, second edition of Multiverser.