Kryptonite isn't something you can't stay away from. It is something that makes you weak. As it did to Superman in the movie. An Achilles' heel. Merriam-Webste

Kryptonite isn't something you can't stay away from. It is something that makes you weak. As it did to Superman in the movie. An Achilles' heel. Merriam-Webster's definition: https://www.merriam-webster.com/dictionary/kryptonite https://www.merriam-webster.com/dictionary/kryptonite