The campaign starts with the party waking up in cages with no memory of how they got there. The cages are being carried by bullywugs, who seem as afraid of the party as they are hostile to them. As they are being led back to the bullywug’s village, one bullywug, named Splug, pleads with the rest of the village to set the party free. He believes that the very existence of the bullywugs is a mistake, and that the party is the only one who can make things right.
Later, at the village, as night falls, the party members notice glowing messages on their right arms. Most read “seek the domed library”, while Exavior’s message reads “trust the surface dwellers”. Some time later, Splug sneaks past the guards to let the party out of their cages, and explains why he is on their side (after a number of encounters that may or may not be filler). Splug has been plagued with dreams of the simpler life the Bullywugs lived as non-humanoid animals, before something went horribly wrong. The world as he knows it is a wasteland, plagued by demons and elementals, and the party is the first group of humanoids he’s ever encountered. Splug isn’t sure what broke the world, but he is somehow convinced the party holds the key to making things right.
As the party travels to the library, members of the party vanish and reappear at random intervals. Every time this happens, aberrant monsters from the far realm appear and attack the party. At the same time, miniature portals appear on the battlefield that the party can use to teleport short distances during the battle. The portals dissipate a few minutes after the battle ends.
After 5 days of travel, the party arrives at the library and finds new gear and books that seem to be written by and addressed to the party members. Each member of the party has a book waiting for them, written by them and addressed to them. The books explain what caused the current state of the world:
When the gods won the war against the primordials who ruled creation, one of the primordials, known as the Blood Reaver, could not be killed. The gods then decided to imprison him in a miniature dimension, separate from the rest of existence, where he slumbered for tens of thousands of years.
Fast forward to the party’s era. A wizard named Farnum Elzwig is trying to find a way to conduct long distance travel without the use of portals. His experiments inadvertently cause the barriers between the planes to weaken enough to awaken the Blood Reaver from his age-old sleep. The resulting shock-wave kills one fifth of the mortal plane’s humanoid population instantly.
Before long the humanoid races band together and realize what is happening and what will eventually happen. The Blood Reaver is not yet completely awake, and the shock-wave was just the initial result of him stirring awake. Within less than two decades the Blood Reaver will be fully awake, which will trigger a second shock-wave that no intelligent humanoid will be able to survive. After that, he will start tearing at the boundaries of his prison, and when he finally breaks free, another age of primordials will fall on all of existence.
Farnum Elzwig managed to save himself from the gallows by coming up with a plan. The humanoids will evacuate the mortal plane as soon as possible to a place outside of existence. Farnum managed to create an area outside of normal reality that can connect to the planes of existence while belonging to none of them, and the humanoid realms then banded together to make it capable of sustaining life. The result is this campaign setting’s version of Sigil, the City of Doors.
At the same time, a party of adventurers will be sent forward in time, exploiting the newly flexible state of reality. Their mission will be to scout the world after the second shock-wave, find a way to re-establish the Blood Reaver’s prison, establish a safe haven for the humanoid races to return to, and, finally, reopen a portal for the people of Sigil to return to the mortal plane.
Because of the dimensional instabilities, the party members arrive in the future with no memory of their lives after the first shock-wave. Furthermore, some of the members randomly get sent back to their original place in time and are replaced by other party members (conveniently, this matches the list of current players in attendance). When back in their own time, the characters arrive with all of their memories intact, and are able to to report to the future population of Sigil on what they happen to find in the future.
The party also finds an item that will aid them on their quest: the first part of the Rod of Seven Parts. Loin, the party’s dwarf, takes the Rod, and immediately feels the urge to travel eastward. The party gears up, and starts their journey east.