There's a little area inside Selune's temple where a rat is running around furiously. It's the bit near the Maglubiyet worshipper in a cage, with three goblins in a "room" with a precarious, holey floor.
If you chat to the rat, using animal speaking or in wild shape form, it's convinced there is something "shiny" buried under the floor. But I've found nothing yet in several play-throughs. Jumping into the darkness below does not end well.
Most rats and animals in EA have secrets, of varying interest, which generally lead to at least something, but this one appears to be telling fibs. Unless it's another reference to the Nightsong, somewhere deep in the Underdark? In which case, the rat revelations are kinda pointless. Anyone had better luck?
