wait, how does the Professor know the sphynxes see straight into your heart and it's not just another unfair Gygax player-killer like an anti-gravity pit trap with a spiked ceiling
the penitent man shall pass
the penitent man is humble
the penitent man makes his Acrobatics check
@Leucrotta tangent: who needs a slowly descending spike ceiling when you can just flip the gravity and make YOU hit the ceiling instead?