The Scarab Sages came into being almost four years ago, formally replacing the old Osirion faction. The premise was pretty simple: recover a host of gemstone artifacts that store the memories of long-dead sages, recruit strong minds to host these memories, and revive the ancient order of Jeweled Sages. Ever since the Destiny of the Sands series in Season 5, PCs have excelled at doing just that, but the Scarab Sages’ story is strongest with a decisive end. How it ends—whether the Jeweled Sages thrive as an ally of the Society or whether they fade into obscurity—depends on you. The outcome will be decided in Pathfinder Society Scenario 9-07: Salvation of the Sages. It’s a challenging one and not everyone will be able to achieve an optimum outcome, but it’s a good one. Be sure to check those reporting checkboxes. It will contribute to the official history of Golarion by the end of Season 9.
As noted on page 28 of the current Pathfinder Society Roleplaying Guild Guide, “any characters affected by faction retirement can retain any faction-based benefits but can’t purchase new items specific to the retired faction. Such characters must choose a new faction at no cost prior to receiving credit for any further scenarios.” In addition, members of the Scarab Sages faction will keep any benefits earned on Scarab Sages Faction Journal Cards, but once the faction is retired, they won't be able to fullfil further goals.
In case you missed any of the Scarab Sage storyline, you can still catch it by playing the following adventures:
PFS 5-12: Destiny of the Sands, Part 1: A Bitter Bargain (Tier 1-5)
PFS 5-15: Destiny of the Sands, Part 2: Race to Seeker's Folly (Tier 1-5)
PFS 5-16: Destiny of the Sands, Part 3: Sanctum of the Sages (Tier 3-7)
PFS 6-04: Beacon Below (Tier 7-11)
PFS 6-19: Test of Tar Kuata (Tier 3-7)
PFS 7-04: The Ironbound Schism (Tier 7-11)
PFS 7-11: Ancients' Anguish (Tier 7-11)
PFS 8-17: Refugees of the Weary Sky (Tier 7-11)
PFS 9-04: The Unseen Inclusion (Tier 1-5)
PFS 9-07: Salvation of the Sages (Tier 7-11)
So that might leave a few of your characters in need of a new faction. Sounds like you'd appreciate a new option, right? How about The Concordance? As with other faction changes, you'll be able to switch your character over to the Concordance freely without spending Prestige Points.