Superman lore gains a new weapon thanks to Supergirl, who presents the official opposite of Kryptonite. Kryptonite's significance to DC's Kryptonian mythos extends well beyond the simple fact that it weakens Kryptonians, as it's a lingering fragment of Krypton's destruction and a constant reminder that Superman's greatest vulnerability is inseparable from his heritage. It has also driven countless scientific breakthroughs and ethical dilemmas throughout the years, having inspired research by Lex Luthor, STAR Labs, Cadmus, and Batman, all of whom have pursued radically different goals and exploited properties that can be altered and weaponized.
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