Streams of corruption spew from the bodies of angels of decay while they are uninjured, infecting all around them with a terrible rot, which they then harvest when injured to rapidly restore themselves. If allowed to regenerate, they can use this engine of rot to repeatedly suffuse the area around them with bursts of anti-life energy.   Angels of decay are creatures of pure, elemental undeath, created by the demon lord Orcus from the corpses of a legion of angels sent to slay him, in mockery of their divinity.   Angels of decay focus on positioning themselves to infect as many creatures as possible with their Festering Presence, using their Foul Unraveling whenever available to keep foes from escaping before infected, and otherwise using their rotting touch against any creature that demonstrates an ability to cure disease.   Festering Necrosis. An infected creature gains vulnerability to necrotic damage. Whenever an infected creature would fail one death save, it instead fails two death saves.