Angels are beings composed purely of Dust. Though corporeal in appearance their physical influence on the world is limited. Higher-ranking angels are easier to see in daylight.
There exist two groups of angels: ones faithful to The Authority and those who rebelled under Xaphania. Metatron is one such angel loyal to The Authority and leads The Authority's forces after being declared the Lord Regent. Two rebel angels, Balthamos and Baruch, aid Will Parry at various times.
Angels can be either humans who became angels, or simply angels. They are termed bene elim or "Watchers". The most important angels are always visible, but less important angels can be seen only in the night. They have the power to modify nature.