Aww shit guys, I might have figured out the last secret challenge right at the finish line!
It's a warning
Pithe is inflexible to the point where altering even a single power, to still work in a similar direction but angled offensively instead of defensively nearly fucked us up bad, to the point of requiring a frankly insane DC to avoid getting something nasty.
"Limited Flexibility", "Stronger but doesn't work outside its scope at all".
So, what happens if we get a second Pithe Ethos?
Since Pithe is described as a 'Resonance', what happens if you're running two separate resonances in the same vessel at the same time?
Nothing good, considering it almost snapped like a twig with a relatively small alteration. How badly would it go if we try to impose multiple Pithe based synergies by grabbing a second Pithe Ethos?
Not well, I imagine.
I think it might still be possible to get two Pithe Ethos and not die. Using two Pithe Ethae at the same time, however, is probably going to be very bad. Given how badly Pithe reacts to any alterations to its base parameters.