The ice-covered tunnels of Deathgorge contain unspeakable treasures frozen within their walls. Those brave enough to traverse the frozen continent of Bjarl and face the curse of Everwinter must battle rival warbands to claim these riches.

The Malevolent Masks lie deep within Bjarl, lost for centuries. Their use grants power to the bearer at a cost, as the consequences of wielding such an item are rarely predictable.

The complete Malevolent Masks Rivals deck can be used by any warband, including those from previous seasons. These cards can be used as a standalone deck in Rivals games, mixed with a warband's unique cards for Nemesis games, or used to construct a deck from scratch in Relic games.

The deck contains a general Rivals deck of 32 cards consisting of:

• 12x objective cards
• 10x gambit cards
• 10x upgrade cards
• 1x background card with a list of Malevolent Masks deck

These cards are used as a complete Rivals deck or as part of a special deck. The Rivals format is designed to be the most accessible way to play Warhammer Underworlds, as players face off using pre-constructed decks in a test of skill.