Idea: what if the two races were humans and drawings and the drawings, while helping humans with technology and magic depending on the person, were too chaotic. It was decided to seal them away, but some resisted. All the drawings were ultimately sealed away into a mountain. Every now an then, escape attempts are made, but all have failed. The security is too high. The only way to exit is through a door. Not a drawing, but a contrasting real door. Only someone with enough determination can open the door.
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