The Last Crucible

Trigger Four or more Small or larger creatures walk onto the pressure plate at area H4a ; --- Effect A magically hardened sheet of obsidian drops down like a portcullis in the western and northern entrances to this room that lead to areas H3 and H5 , respectively. Any creatures standing in one of these squares takes (4d6 + 4) bludgeoning damage from the falling wall (DC 24 reflex) and then decides what side of the wall they want to be on. At the same moment, four thoqquas that have spent centuries in hibernation awaken and emerge from vents into area H4b . The trap then rolls initiative, as do the thoqquas.