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"arc reactor" is a TikTok video posted by capwithoutacountry on 5 July 2021.

Transcript[]

"The arc reactor that powered Tony Stark's armored suits originally contained a Palladium core until that nearly poisoned him and had to be replaced in Iron Man 2 with a newly-created element derived by Howard Stark from the Tesseract and the energy of the Space Stone. If that synthetic element, which Tony later tried unsuccessfully to patent as 'Badassium', had produced enough thermal energy to damage the shield, then it would have burned Tony alive inside his suit, so when Steve shattered the reactor in Civil War, he likely just disrupted its ability to transfer electrical energy to the suit without actually rupturing the core."