Where Chaos Reigns is a multi-part adventure across different eras of a parallel world named Aelos. Players, guided by Immortals, journey through time using a Nexus, confronting a technologically advanced race called the Oards. The adventure involves various encounters with monsters and NPCs, culminating in the destruction of the Oards' Entropy Bubble. Detailed statistics for creatures and items are provided, along with maps and descriptions of locations. The module offers significant role-playing opportunities and strategic combat challenges.