perhaps this is posted some where but in all honesty i am kinda stuck...here is my issue:
I recently finished the second darkness path it was awesome how ever i wanna continue with the PC's in a story arc that goes beyond allhevrahs plot. My idea is to use
Nyarlathotep as a great old one. Now I'm not gonna use its whole tenticle raping monsters idea... Or I may to some degree but to me I picture him as pharroh wandering the stars awaiting the day he can return to reality to claim his proper place over his father (he is after all one of the spawn of cthulu). Now the plot of second darkness involves the second coming of a starfall event. In my world the PC's actually kinda failed and didn't prevent the spell from being completed but did manage to destroy most of the seals. The asteroid came and it exploded doing no major damage. But off of this I wanna twist a plot where Nyarlathotep actually manipulated Abraxxis (being only a minor demon lord) to call the star on which he rode and returned to Golarion.
Ok so there is the idea. I have alot to flesh out in the middle still and i have alot of ideas to do that. My issue is how would I go about creating the old one and not making him a party killer. One ability I pondered is a slowing aura. Maybe not like a slow spell but i was thinking a -8 to initiative for all within 120' the big ability is to spawn a replication of 1 random party member per round this image only does 50% from any source and is a perfect image down to the items (I'm prolly gonna photocopy the PC's for this fight). I just don't know what is too much I'm thinking CR 23 ish with the normal old one rules immortal death throws ect. I guess i just need ideas i dont have many others to pick for ideas to be honest. Really any ideas would be wonderful.
Thank you in advance
DM Jay