Examine the rock and go south 1 screen. Enter the house, go up the stairs and talk to the pig. Exit the house, go south once and then west. Pick up all the goodies and leave again, go west a screen now and examine the well.
Select the first choice. Go east, then south. Kill the slayers and go south again. Go west and through the arch. Talk to the pig, an automatic sequence follows. Go west and talk to the guy. Go west as far as you can and through the arch. Read the post, and you've finished the d-mod!