I'm really impressed with this. I'm going to adapt it for my Xen'drik Expeditions game, where the PCs are already searching for the fifth of five magic objects from an ancient Giant kingdom, and already are chasing a rival group. So I'm going to have to make some changes, and also scale it for 10th level PCs.
1. Scaling:
Mostly easy. The dragon will get bigger. The female mummy will get more levels. Maybe make the Shield Guardian a stone golem.
I'd like to do better than make the heirocosphinx 18hd, like give it a cool template. Fiendish is one possibility, but too dull. Maybe Phrenic, since psionics is always fun to throw around in Xen'drik. Suggestions?
Any suggestions for making the Swarms of organs tougher for 10th level PCs? I'm thinking of adding the mummy rot effect, since that's lacking in Osirian mummies.
Any suggestions for advancing/scaling the Belker.
2. Theme
a. I'm making all the pharaohs except the female giants (the rooms will be a bit bigger), and the female is an elf. Yes, that will be an enigma, that the giants allowed an elf to rule. Maybe they got told that would be a good idea by those from the Black.
b. Eberron doesn't have significant planets. I could leave this as is, as a strange enigma, but it also would fit with the destroyed thirteenth moon. Eberron's missing moon can fit in here. Maybe a chunk of it floats in the void still. To keep the numerology, the missing moon can be 11th in order. Its associated with Dal Quor, so Phrenic makes some sense
3. If this is a giant empire leftover, then the pyramid can't be too recent, and has to be 40K years old about. So the Heiracosphinx is not the source of the mask feathers. (maybe its a ghost sphinx!)
What do you think?
Phrenic is a good template, but Dal Quor could also be a source of pseudonatural creatures. There is also the dream creature template from Advanced Bestiary, as well as the nightmare creature template.