I've dramatically changed Book Two of Rise of the Runelords; the party is six strong (seven with the DMNPC I was running before we had the last two players join and I'm writing them out of the story at the end of book 2) confronting a cult of Norgorber inside the Magnimar Sewers. The cult thought they had lured the party in and knew their strategy; but the party decided at the last minute to just kick the door down.
The party is now in a combat against 121 cultists of levels between 3-12. They have killed 27 CR2 Faceless Stalker variants, 2 regular Faceless Stalkers, and 1 level 12 Inquisitor VMC Rogue with PC wealth. They also managed to get some poison gas piped into the room to knock out a large number of the cultists.
They have taken 9 points of damage. Luck has played a significant role, but I have been doing some behind the scenes tuning to make sure the other 90 enemies pose a threat. Well, whatever of those that are conscious.