The mission is simple. Grab the key. Close the gate. Get the hell out of St. Francisville, Louisiana.
What could be so frelling hard about that?
The clock is tick-tick-ticking and the team of demon fighters are running out of time. First, they have to find the key, then get through the demon army protecting it, and then fight the one who master-minded it all.
No problem. Easy as pie.