I’m stuck in mushiroom cave, I’ve been stuck here for a long time and have no idea how to obtain the third rune stone. When solving the puzzle involving five pillars using the two rune stones I obtained, I managed to unlock the wall in the upper left by placing the stones in different orders. However, there is no rune stone on that pillar, and I’ve never been able to get the third rune stone. Could this be a bug? It’s really troubling me. Could you please help?