I'm stuck. It said I have to figure out a way to open the big door. I've ran around all over clicking the "OK" button. I got the "Tablet Fragment" and have no idea what to do next. I've been throughout the entire Crimson Forest a dozen times.
That rock pillar you see with the green mark on it? About 1/4 of the way up the middle stairs? Push that to the side out of the way and then run to the top of the stairs to activate the boulder. It will roll down and break through the door at the bottom.