If a unit with Assault 3 (like Vayne) enters a contested battlefield and the opponent uses Fog of War to remove all defending units, does the attacking unit keep the Assault +3 Might bonus for the rest of the showdown, or lose it during cleanup?

Ruling: The attacking unit keeps the Assault +X Might bonus for the entire showdown even if all defending units are removed. Once combat starts, it continues until resolution (both players pass on empty chain with focus) regardless of whether one player no longer has units at the battlefield.

Sequence:

• Unit with Assault enters contested battlefield
• Unit gets assigned Assault bonus and defender status is assigned
• When I attack/defend stack happens
• If opponent removes all their units (e.g., with Fog of War), the Assault bonus remains
• The attacking unit maintains its increased Might (5 total for Vayne with Assault 3) until conquest

Nuances:

• Similarly, if you're the defender with 1 unit and a hidden card, and your unit gets moved/removed on attacker's first focus, you still get focus back and can legally have 0 units but 1 hidden card while maintaining control during combat
• This interaction was clarified/added as part of V1.1 and the first patch notes