Run up to a door that Hayes will point out and there will be two boxes one with a shotgun and the other a snipe. You will then have to fight an onslaught of rexes after you fight a bunch of waves you will be introduced to the vastasourus and three more rexes once you kill them all Ann will point out a tunnel follow her through a cave kill a bunch of millipedes then you will see a island with a urn fight of some crabs grab the fire light the urn then run back through the cave and burn the bushes guarding the posts then run through the second tunnel fight two millipedes and a Rex then burn some bushes killing two more rexes then grab a lever then open the door