Apologies to do these out of order, but I've had a lot more experience with these stat blocks now and I feel confident with them, so here is:
Part 6: The Pinnacle of Avarice
X1 Entrance Ramp (CR 18)
- 4 PCs: 1 Warden of Song, 1 Warden of Wind, 2 Wardens of Thunder
- 5 PCs: 1 Warden of Song, 1 Warden of Wind, 3 Wardens of Thunder
- 6 PCs: 1 Warden of Song, 2 Wardens of Wind, 3 Wardens of Thunder
X2 Visions of Karzoug (CR 17)
- 4 PCs: Karzoug’s Image and 1 Warden of Thunder
- 5 PCs:
- 6 PCs: Karzoug’s Image and 2 Wardens of Thunder
Note: The Warden(s) stand as guards of the Throne Room, but they’ll come to Karzoug’s aid against the PCs after warning Viorian of their presence.
X3 Throne Room (CR 20)
- 4 PCs: Viorian Dekanti, 1 Warden of Song, 2 Wardens of Thunder
- 5 PCs: Viorian Dekanti, 2 Wardens of Song, 3 Wardens of Thunder
- 6 PCs: Viorian Dekanti, 1 Warden of Runes, 1 Warden of Song, 2 Wardens of Thunder
X4 Rune Giant Lair (CR 18)
4 PCs: Karzoug’s Image and 1 Warden of Runes
5 PCs: Karzoug’s Image, 1 Warden of Runes, and 1 Warden of Song
6 PCs: Karzoug’s Image, 1 Warden of Runes, 1 Warden of Song, 1 Warden of Thunder
Note: I moved Karzoug’s image into this room so it didn’t instantly get destroyed, but this fight is scaled on the assumption you did not do that. Move it where you wish.
X5 Lamia-kin Quarters
While this room is typically empty, if the party either failed to kill, or never encountered Yolanda (Lamia Matriarch Ninja 8), she may be found here. She seeks the aid of the lamia priestesses in X6 if attacked. I also recommend moving the Image of Karzoug into this room.
X6 Priestess Cells (CR 17)
- 1 Priestess of Divine Consumption per PC, but with Sihedron rings
X7 Hungerers’ Den (CR 17 to 19)
- 4 PCs: 2 Hungerers +1 per Lamia Matriarch that has tried and failed to defeat the PCs in...
Sorry for the confusion here. You have down Isis and Ceoptra’s attendant down in the Most High Ceoptra fight. Where are we able to find those stat blocks?