From publisher blurb:
Saitan’s defeat proved only the beginning, and now distant planets are pulling themselves apart in the skies! Worse still, one of the greatest allies of the fight has gone missing - and now needs to be rescued from a vessel that exists in many places at once. Our heroes find themselves embroiled in a fight for the very future of existence itself, and are forced to confront the new herald of Omega, the leader of a shadowy organization that has been dogging them since their journey began. The decisions they make throughout this adventure will cement the fate of their empire, their world... and maybe all of existence itself.
Inheritor of Entropy Heart by Michael McCarthy for 18th to 20th level player characters.