Torture: Burning Pitch

They stake the victim to the ground, cutting, beating, and pretty much softening them up. Sometimes they leave them there for days in the sun, and
sometimes they don't. Sometimes they spread pitch all over them, and they light it. Can't imagine that kind of agony, what with it blistering their skin
all up, burning it away, and cleaning the victim out straight to your bones.
Pitch would do that. Wouldn't stop burning for some time, long enough for them to be dead anyway.