She was never a weapon.
She was the point where a decision was made; a future began, a past ended. If the decision was to destroy, she would become a Destroyer. If the decision was to create, she would become a Creator.
The decision was to stop, delay, hide, protect. She became a Protector. A Guardian.
She holds them all within herself now: children, parents, war-torn cities, civilians, warriors, High Council. The mad and the sane, the dying and the newborn. For the Lords of Time, time has been stopped.
All of Gallifrey, caught, held safe, inside the Moment.