The Burned are Demons that have managed to reduce their Cover to zero.

Unlike other supernaturals that have reduced their morality to zero, like a Zi'ir or a Wretched, Demons can still function "normally" without their cover, but are permanently exposed to the God-Machine in their true, demonic form, which can also attract unwanted attention from hunters and similar groups. A Burned will either be taken and recycled by agents of their Creator or destroyed by other, equally hostile forces unless they manage to find someone willing to grant them a new Cover via a Pact.