I'm still waiting to see what Oleander knows (he rolled a skill check) before posting again for Brother Pi.
Hmm, I'd forgotten about that roll. Thanks for the reminder.
Sweet oil of Vitriol: Oleander remembers one very important aspect of sweet oil of vitriol, it is a highly flammable liquid. It wouldn't take much for the oil to ignite, even trace amounts of it. An open flame could cause the remaining oil (or the vapor in the air) to ignite but even naturally high temperatures could ignite the oil. (It's not a hot day, so the suns rays likely won't ignite it.) Vapor formed from the oil is heavier than air, so it can collect low to the ground. The oil's vapor may travel considerable distances to ignition sources, which does not need to be an open flame. If any of the vapors have traveled down towards Crater Lake, they could come into contact with any sort of explosive source, such as a forge or cooking fire. If so, then BOOM!
The oil is a powerful drug that is highly intoxicating but is also used by healers (without magical skills) to induce sleep in patients who are in pain, which helps the healer deal with deadly wounds (until a cleric can be found). As a drug, it doesn't cause withdrawal, but those that become addicted to the oil crave it and the will to consume more of it is high. On the streets, addicts often refer to the liquid as
ethereal oil. Those addicted to the oil are said to be suffering from
etheromania.
FYI, your latest post is based on what is happening with the other three PCs. That isn't where Brother Pi and Oleander are in the city. They are looking at a different building that was vandalized.