Fire Beetle Paste
This thick, red paste is a mix of chemicals and distillate of fire beetle glands. It can be spread on surfaces and will burn fiercely for 1d4 rounds once touched by open flame, doing 3d6 points of damage each round (halve the hardness of the object before damage is applied).
It can burn through wood, stone, and even metal. One dose of this substance is sufficient to draw a half-inch think line 1 yard long. Though a container may be ignited and then thrown, it does not stick or splatter when used in such matter, and has no more effect than a thrown torch.