I have a BBEG that's going to challenge my solo character and her NPCs soon, but I need to interrupt and distract this mostly-lawful/good party for a while.
I have two worlds, one a lot like Golarion and one that's entirely homebrew (the extraplanar creatures of the second world are different - Aeternals [lawmakers and enforcers], Fallen [the ones who turned away from the Aeternals], Totems [elementals/forces of nature], Oni [corruptions of natural forces in the forms of demons], Undead, Fae, Dragons, Oozes, Constructs, Gorgons [all creatures that petrify], and Shapeshifters).
The Aeternals just recently re-constructed their city and the Fallen have no leader. Dragons - who in this world have evolved into psionic humanoid-like beings who possess futuristic technology - have just recently reappeared, but have no real desire to interact with the world.
So ... what kinds of challenges would you guys throw up against a level 16/17 solo party while I'm prepping the BBEG?