Synopsis: Continuing to explore the lost laboratory inner sanctum, the party found a library and its ghostly librarian protector. The librarian first mistook the party for his apprentices, and then realized that he was being visited by a Runelord herself! The party next encountered a sanity-draining abomination from beyond in a conjuration lab; after defeating it, they discovered a Thassilonian portal key, although not the one they needed. But the adventurers did put the key to good use in the final room of the lab: a room containing three Thassilonian portals, one of which opened to reveal the Sihedron key they sought!
Detailed write-up to follow.