The daily mission (9/15/14) has us descend into the temple of crota to find the ritual chamber where the hive are draining the traveler of light. I'm playing on lvl 24 heroic and i can get as far as the circle of bones before the enemies stop spawning and doors stop opening. The ghost says to hang a right at the circle of bones to a room that i believe is always empty of enemies on this mission, i make a left here through a crystal-lit cave to an area that should have enemies, but there are none and all the doors are closed. I've tried this twice now to no effect :(