When you lead people in a task, make a Knack Skill roll. They increase in Scale by 1 for every success achieved, up to half your Legend rating, for one action (which may be part of an extended task, though not combat). A team of five people can build a skyscraper, or a small band of warriors can hold a chokepoint against an entire army, etc. You may spend Momentum for the task to increase Scale one for one above the number of successes achieved, again to a maximum of half your Legend rating.