I am putting together a campaign where the PCs start as squires for a max level adventuring party.
The story however will start with the level 20s dying, leaving the level 1 PCs woefully unprepared to take on the world ending threat the 20s were handling.
How can I go about killing these characters in a way that is believable and funny? Bonus points if it is somehow the PC's fault.
An issue I am running into is any high level party would be functionally immortal being only a few thousand gold away from a resurrection.