In Trail of Cthulhu characters have three Pillars of Sanity. As their Sanity drops, these can 'crumble from within' and are lost. Is there a mechanic for pillars to be destroyed without the dropping of Sanity?
I have a PC who has 'the theory of evolution' as one of their pillars. They've just seen something so alien that it is impossible for the theory to explain it. However, they passed an associated Stability check when they saw the monstrosity.
Does this mean that they've effectively managed to fit what they've seen into their understanding of the world so the pillar stays intact, or would it be reasonable for the pillar to be destroyed despite them passing the Stability check?