Endurance 1

To Venser the room seemed to never end. They walked for a time and then they ran. Hours passed and perhaps days, but Elspeth would not let them stop. Even when the cuts on Venser’s chest began to throb and his thinking was muddled by the blow to his head, even then Elspeth would not let them stop.

Scars of Mirrodin: The Quest for Karn, Chapter 17