An angel who roamed the Place Between, taking a keen interest in the Doors that opened up rifts between realities. It would close them and deal with any living beings with prejudice.
Killed Zephyrus and Xalati, almost killed Salinger and Peach.
Not, apparently, the Angel of Kings.
There’s a “conceptual relationship” between the myth of the goddess Brunnhilde and the Angel of Doors??