You are cult members, tasked with summoning the dark one, calling down the dark times and bringing darkness to all things... light.
You've just completed your unholy communion with the dork one and you've been told that YOU are the chosen one and that ultimate power shall be yours.
Yay!
Unfortunately each one of your culteagues (useless, every last one of them) has also been told that they are the chosen one and that ultimate power shall be theirs. The communion might not have gone as expected - only half the spell was legible and you had to guess the rest. As a result the drk won slurred a lot. Some things weren't clear.
You now have to complete your dark ritual before the others complete theirs, summon your dirk lard and-
Oh, did you fail to notice that the heroes are about to breach the lair?
They're hoping to save the world in the nick of time. It doesn't matter, your plan for world wide domination is foolproof!
You should tell them all about it.