The 66 cards in this pack are separated into seven decks – Deployment, Mission Rule, Primary Mission, Attacker Secondary Mission, Defender Secondary Mission, Attacker Gambit, and Defender Gambit.

This pack includes:
- 5x Deployment Cards
- 9x Primary Mission Cards
- 12x Mission Rules Cards
- 32x Secondary Mission Cards (16x Attacker, 16x Defender)
- 8x Gambit Cards (4x Attacker, 4x Defender)
- 6x 40mm Objective Markers
- 1x 10-Page Rules Insert

You will need a copy of the Warhammer 40,000 Core Book to use Chapter Approved: Leviathan Mission Deck.