In the entrance of hell, there is now a contraption where the great stairway is shaped by hitting a switch. Problem is that, for whatever reason, there is still a line corresponding to the lift or something? In the automap options, make sure "show trigger lines" is on (and you are using a custom color scheme), and look for the white line. Activate it. You are now trapped in an illusiopit! Wow!

.. oh you.

I guess I should've checked harder for those lines..

Fixed