The 366 page lavishly illustrated hardcover rulebook contains:

Rules for creating characters and a shared world, for playing adventures, and for crafting encounters and campaigns as a game master.
Detailed advice on GM craft, player best practices, worldbuilding, campaign building, and full tutorial examples of play.
Dynamic adversaries and environments to challenge your characters, from the Immortal Crab of the Solsunk Sea to the courtly intrigue of the Baronial Court.

The box of 279 beautifully-illustrated cards securely clasps with a magnet, including:

18 Ancestry Cards
2 sets of 9 Community Cards
54 Subclass Cards
189 Domain Cards