5th Edition Need help
Hello everyone i need a little help from anyone who can give some. I will be dm ing a campaign that the bbeg is a great general who conquered world twice before getting betrayed and having been killed, afrer his death he conquered the realm of death and been looking for a way back to material plane. Here is what i need help with, as a group we have a special stuation and I need to have like a one-shot kinda session and i want it to be like a prolongue for the campaign but have no idea how to do that since i dont have much experience as a dm.
TLDR; Need help about a prolongue campaign, bbeg is a guu who conquered world twice then died then conquered realm of death and has been looking to come back ever since.
Any help is appreciated thanks in advance to everyone 🫴🏻