You review the details. You are in a cave somewhere and one monster is very well known for living in caves; the stone-splitter ogres!The are earth monsters and are used to living in the grasslands. What is the main enemy against grass? Fire of course. And the oil is the perfect weapon. You remember you learned a bit about fire from your trip to the burning lands and you know how to make napalm. You feel around in your pockets and are glad to find some orange juice left from the trip at the bar. You mix that with the oil to create napalm. The stalagmites are also made of limestone and are not flammable meaning that you also won't be roasted alive with the ogre. When you see the ogre's head poking in to check on its prisoners, you toss the napalm straight into its face. The ogre screams in pain and tries to shake the fire off but to no avail. You take that moment of advantage to sprint off into the night.