Defend the tomb from the robots and the spirits will allow you to have their Australium. Standing in front of the obelisk near the first point will grant you minicrits. Losing the point will release vengeful spirits that will attack robot and man alike. Some waves also have curses that introduce hazards.
The laser that corresponds with the minicrit buff probably wont work with multiple people in the trigger area and may flash wildly. Will probably set it up to only be active for one person at a time. I also wanted to make it not work when under the roofed bridge, but I couldn't get it to work.