Excerpt from Vote Vampire
At the currency exchange...
"What are iron drabs?" asked Ferdinal. "I've never heard of those. They can't be worth much."
"You can buy simple necessities with them," said Perancia dismissively. "A handful of iron drabs will buy some powdered soup or a scrap of torn vellum that's been scrawled on one side. But mostly iron drabs are used to taunt people. Because they're so worthless, they are promised as wages for some low-grade tasks, or as a paltry reward for an unwanted service. That's demons for you."