Mimir

A strange humanoid skull apparently made out of colored glass and various metals.

After some discussion, the githzeri scholar mentioned a modron having visited a while back intent on rejoining its branch of the Great Modron March. It had a mimir (a humanoid skull-shaped recording device) it was using to find its branch of The March. The modron found what it was looking for and departed months ago, but left the mimir (apparently the skull the party was carrying). The mimir had been damaged in the Yugoloth attack and wasn’t working.