Underdark South of Chrysoprase
We head down the river, deeper and deeper into the underdark. As we travel, we see no sign of creatures, but know we are being watched. Then we see these rats, their brains exposed, called Cranium Rats. They are the scouts for the Elder Brain, a vast intelligence that rules over the Mind Flayers and their many slaves.
We travel further into The Elder Brain's territory, and rest in a corner tunnel.