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- "Cassiel isn't really anyone's friend."
- ―Jupiter on Cassiel[src]
Cassiel comes from the Hebrew קַפצִיאֵל (Qaftzi'el), though it carries uncertain meaning. Suggested meanings include "speed of God," "cover of God," or "God is my anger." Cassiel is the name of an angel in non-canonical medieval Jewish, Christian and Islamic mysticism, often one of seven archangels. It is not to be confused with the similar name Castiel.
- Wundersmith: The Calling of Morrigan Crow (Mentioned only)