Thanos’ sword is not officially confirmed in the MCU, but the strongest fan-based answer is that it is made of some extremely durable off-world metal, with many guesses pointing to uru or a similar cosmic alloy. Marvel materials are left ambiguous on purpose, so there is no canon statement naming the exact substance.

What the sources suggest

  • Some fans argue for vibranium , but that is mostly speculation and does not fit cleanly with the MCU’s established lore.
  • Other writeups and theories favor uru , because it matches the weapon’s power level and cosmic origin better.
  • A few discussions mention adamantium or even other exotic metals, but those are less supported and often tied to future MCU possibilities rather than confirmed canon.

Most likely answer

The safest answer is: the sword’s exact material has never been explicitly stated, but it is probably a highly advanced alien metal, often theorized to be uru.