Tribulation of the Dead from Survive RPG looks like it would work for Rot World. There is a strong role-playing element in the scenario though. Alot of realism, grittiness, blood, violence- might not appeal to alll players. It has 5 parts so far, some free, some $1 or 2.
To defend: This is the Pact. But when life loses its value, and is taken for naught - then the Pact is to Avenge.
War of the Dead seems like a good set of adventures. There are 52 scenarios, divided into chapters. Each pdf or book, is a chapter of 13 scenarios linked together for one campaign!
To defend: This is the Pact. But when life loses its value, and is taken for naught - then the Pact is to Avenge.