The Harpies nest (location 6) says that PCs much make a CON roll each round or become Dazed. If they fail once and become Dazed, then next round as per p51 they would have to take another condition if they fail a CON roll again. Anyone done this, I wondered how dangerous it is?
It also says they can hold their breath as per p53 (swimminmg/drowning), but that's also a CON roll. So if they hold their breath, they would make a CON roll to hold their breath each round, and if they fail they will make another CON roll to avoid Dazed or another condition? Unlike drowning they could then hold their breath the next round - maybe not as they have already breathed in the scent.