Lonewolf is an action card introduced in the "Nightmare" expansion set of Resident Evil: The Deck Building Game. When the player's character explores, the player selects one weapon they are using. That weapon gains +5 damage during the turn this card is played for every card in the player's discard pile. This card also allows provides an additional 20 ammo and has a gold cost of 80.

The artwork depicts Jack Krauser before his final confrontation at the ruins on Saddler's island in Resident Evil 4.