Originally Posted by
Lyth
The Mistborn analogy doesn't apply well here. The central problem is 'main villain is immortal, nobody can defeat him.' When the resolution to that conflict is 'The protagonist was secretly more powerful than she realized', then there never was a conflict to begin with. It doesn't really matter when you introduce that fact. Deus Ex Machina eliminates the central conflict by sidestepping it. Sanderson's point about having a 'victory condition' is important. He contrasts Helm's Deep and Pelennor Fields in that the solution to both problems is similar (big army shows up, we win), but one has a foreshadowed victory condition (survive for five days) and the other does not. Without that victory condition, there is no dramatic tension, because you can just win at any point that you feel like. You can, however, distract the audience from that condition, which is why its to your advantage to introduce the rules of the game earlier rather than later.