A literary device that gives hidden information or tells about the future and is used to move the actions in a play could be a paradox
A paradox is a figure of speech which refers to a statement which is self-contradictory because it involves two or more facts that are opposite but can be true. The statement or situation can be contradictory or opposed to common sense.
The information in a paradox is usually hidden but gives a perspective about the future and the type of moves the actors in a play can make.
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