In The Book Edit
Angrbod first appears in the book as a firebird, when she has had her son capture Loki. She places "all her resources" in Loki's hands in exchange for him rebuilding Asgard with a place for her.
Angrbod (Angrboða) is a giantess of jötunheim. She is the mother of Fenrir, and also of Hel and Jormungand. She lived in Ironwood, where she became Loki's consort after he left Asgard. Via Fenrir, Angrbod is the grandmother of Hati and Sköll.