Loki's Oath is a collection of devotional work for followers of Loki Laufeyjarson and his family. It contains prayers, blots, and rituals that follow a Lokean Calendar that was developed by the author, Jennifer Lainhart, in 2019, that corresponds with members of Loki and his family each month. Loki's Oath is a workbook of sorts, requiring a journal to record thoughts and experiences had during meditations at the end of each ritual. This book is a remake of Jennifer's first book, Hail Loki, and looks very different with the addition of Loki's family members, and changes to the rituals. Overall, Loki's Oath is a completely different book than Hail Loki.