Foreshadowing is a clever technique used to kind-of hint at or present that something will happen usually by not giving too much away.
In your example, a means of foreshadowing could be multiple methods, from subtle hints that he enjoys or craves his power to how he uses it constantly to fight evil or whatever. However this works, they're subtle hints that foreshadow that he may turn evil himself by doing so.
Generally speaking, foreshadowing is really a means of trying to hint at something like that, but of course people can also pull a trick on the foreshadowing element was misleading by not having what it was attempting to "foreshadow" come to pass.
Anyhow, I hope that answers your question and can help you. If you have any other questions regarding this I'll be willing to help. Have a great rest of your day! ^ ^
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