Such a fuss ofer a few mundanes." Mrs Dark chuckled and moved to stand beside her sister, so that Will, with his blazing sword, was between Tessa and both ladies. "We have no quarrel with you, Shadowhunter, unless you choose to pick one. You have invaded our territory and broken the Covenant Law in doing so. We could report you to the Clave-"
"While the Clave disapproves of trespassers, oddly, they take an even darker view of beheading and skinning people. They're peculiar that way," Will said

Author: Cassandra Clare