In the Delta's Hotspot post on burning oil, there's an example of players claiming that an entire barrel of oil should do 20d6 damage, or something like that. Now, I'm not really big on delving into minutiae for the sake of real-world accuracy in the context of a game, but this seems obviously wrong; if I use twice as much oil, are the monsters twice as on fire? More oil covers more area, so you might need an entire barrel to do 1d6 damage to a dragon-sized creature, but it's not going to do more damage to a goblin, just because there's more oil. It might burn longer, doing more damage if the goblin just stands in the middle of it.The example player qyote strikes me as wrong, too: "We got giant barrels of oil and just flooded the whole dungeon and lit it on fire from the outside, and got all the XP!" If we assume by "flooded", they mean every corner of the dungeon has oil on the floor, well, it takes a while for the oil to spread. What are the dungeon's inhabitants doing in the meantime? Can't they go investigate? Or stand on some rocks?
In any case, if you kill something without knowing it was there, can you really gain experience?