Eclipse Phase is a tabletop roleplaying game of post-apocalyptic transhuman conspiracy and horror.

An "eclipse phase" is the period between when a cell is infected by a virus and when the virus appears within the cell and transforms it. During this period, the cell does not appear to be infected, but it is.

Players take part in a cross-faction secret network dubbed Firewall that is dedicated to counteracting "existential risks" — threats to the existence of transhumanity, whether they be biowar plagues, self-replicating nanoswarms, nuclear proliferation, terrorists with WMDs, net-breaking computer attacks, rogue AIs, alien encounters, or anything else that could drive an already decimated transhumanity to extinction.