How does Vitality interact with effects that add two or more Blight at once (e.g., Kingdom of Sweden Level 1)?

How does Vitality interact with effects that add two or more Blight at once (e.g., Kingdom of Sweden Level 1)?

Each Vitality prevents 1 Blight. Depending on the number of Vitality relative to the number of Blight added, this may or may not prevent all of the Blight.