Touchstone

Touchstones are humans and demons whose lives uphold precepts of the Treaty of Dis. Each one is ritualistically bound to a single law. Most of them live in Hell and are protected for the duration of their tenure.

Much like the greatest kopis, a line of succession is determined in advance of their death. There are always two touchstones for a law: one that is current, and the next in line. What law each touchstone upholds is a secret.

In The Darkest Gate, it is mentioned that Isaac Kavanagh is a touchstone.