Serax-Dral

Serax-Dral, Master Infiltrator is an aberration from the deep reaches of the Astral Plane who has come to Faerun seeking to steal the Astral Orb. He can take on the appearance of any humanoid after consuming them, and has been using this power to hide amongst the townsfolk of Grey Hawk. His former victims include Tony Pajamas, Gerthwin Bartelby, Sigbjorn Hagisson, Harie, Captain Finstrade, and Perce Pewtercrest.

Seedtime 5: Serax-Dral was defeated by the party in the Battle of Grey Hawk.

Seedtime 9: The party discovered that Serax-Dral had faked its death and had infiltrated the group using the disguise of Perce Pewtercrest. Rip and Aired Helelar killed it for real and fed it to the Mindwitness to gain access to its knowledge.