The four characters are thrown into a twisted version of the city, overrun by zombies, and are guided by a mysterious, unreliable figure called the Shadowman.
Every one of them is a lying, conniving, manipulative and selfish individual with a long sordid history of past misdeeds.
Collecting the Gateworm will signal the end of the ritual, and obtaining all four of them is one of the main goals of the Easter Egg.