Default Altars:
#1 Pactmaker
#2 Dracul
#3 Binlor
Preparations available:
- Earthmother in slot #1
- Conjunction in slot #2
- Mystera in slot #3
Confirmed:
- No altary preps gives default altars: Pactmaker, Dracul, Binlor
- Conjunction + Mystera gives: Mystera, Earthmother, Pactmaker, Dracul
- Earthmother + Mystera gives: Mystera, Earthmother, Pactmaker
Untested (and my guesses):
- Earthmother only (guess: Earthmother, Pactmaker, Dracul)
- Conjunction only (guess: Earthmother, Pactmaker, Dracul, Binlor)
- Mystera only (guess: Mystera, Pactmaker, Dracul)
- Earthmother + Conjunction (guess: ??? + Earthmother, Pactmaker, Dracul)
- Earthmother + Conjunction + Mystera (guess: ??? + Earthmother, Pactmaker, Dracul)
If anyone prepared any of the untested combinations... Or is yet to do the run and fancies doing some of them... It would be much appreciated to share what some of these combinations yield... I'm especially interested in the last two, but I wouldn't be surprised if some of the first three would also contain surprises...

"Thinker", just without the "ache".