A Secret Passage!
Letter to Ninaran from Kalarel
I received your report on the adventurers. Next time you see them, put an end to their meddling. Mix the blood of ten people with the elixir my messenger brings. Then trace the following pattern on the ground of a graveyard and pour the liquid into the lines. That should supply you with a force to thwart them. I’m very close to completion; see that I’m not interrupted. As you already know, if you do come to the second level of the keep, the pass phrase is “From the ground, some magic was found.”