Inside the set, you'll find:

- 20 gambit cards – designed for Arena Mortis but usable in any version of Warhammer Underworlds
- 20 upgrade cards – also compatible with standard games of Warhammer Underworlds
- 20 hazard cards, usable only in Arena Mortis (including the previous edition)
- A double-sided game board to play on, compatible with existing Warhammer Underworlds boards
- Tokens and Cards for keeping track of the game, including six new Mortis Lenses
- Fighter cards for Regis Fulbringer and Dolorghast, available in print for the first time