Based on the works of Michael Moorcock, Hawkmoon is a stand alone role playing game that can also act as a supplement for the Stormbringer RPG.

The box set contains the following:

- The Players Book: background information, timeline, character creation, weapons, skills and more.

- Science Book: information on technology, invention, travel between the planes and more.

- Gamesmaster Book: creatures, mutants, treasure, a starting adventure and more.

- Reference Sheets: various tables and assorted information gathered from the books.

- Map of Europe: as it exists in the setting

- 3 dice: d6, d8, d20.

Hawkmoon is compatible with versions 1 to 4 of the Stormbringer RPG.