What It Does
A light, held — the light reveals, and the revealing is the whole argument, and the one who is revealed is the one who was already the shape. It is the cantrip of the school: the light does not kill, the light answers, and the answer is the one the camp has to read.
The Cost
Circle 1 · Light · Exchange: gesture — casting time one beat. On the ladder in The Veil, the gesture rung is the price.
The Failure
The light is held a beat too long, and the light keeps the tension — the light is the one who reveals, and the one who is revealed is the one who was already the one the camp was not looking for.
In Stories
The camp's first light spell; the one the new arrival casts when the dark is the argument and the light is the one who has to answer.
The door's scale anchor is Luminary — the dragon casts it without thinking, which is how a reader learns the shape of the thing.