The Familiar Journal toy is a new toy added in Patch 10.1.5. This toy can be found in Old Scholomance, a version of the dungeon that’s only recently become available again.
Getting to Old Scholomance
As of Patch 10.1.5, it’s possible to unlock Old Scholomance, gaining access to the old instance for long-lost recipes and transmog. We detail how to access the old version of the Scholomance dungeon here.