Hey everyone. I'm currently DMing for a group that is convinced they're ready to take on the Big Bad of this campaign in spite of being lvl 12ish. So how could I make it a kinda story driven failure without literally having them all die. Similar to how some video games will have no chance of ever beating a specific boss in order to drive some sort of plot hook. I'm having a little trouble not being a jerk about it. Lol. Thanks in advance.
