Bulwark: One Shall Stand

From publisher description:

Go It Alone

You don't need friends to cause mayhem on the battlefield. If you like taking a lone Bulwark Hero into battle, then this pack has you covered. It includes three replacement card types for existing decks (Zsuzsa and Sandor from the base set plus the Tower of Secret Lore from Travails of the Arcane) that work better when there is just a single Hero fighting. It also includes 5 solo challenges, custom Foe decks with cards taken from all sets pre-Twisting Passages.