Vibranium

Vibranium is a type of metal that has come from space.

Background
Before the series begins, a Vibranium meteor landed in the small, hidden country of Wakanda, a third-world country and isolated from the rest of the world. They decided to keep it secret.

In the 1940s, during the events of Captain America: The First Avenger, Howard Stark presented vibranum in Los Angeles, claiming it to be a metal found in Africa. He later made Captain America's second shield out of vibranium.

In Black Panther, it is revealed in the 1990s, Prince N'Jobu began selling it worldwise with partner Ulysses Klaue before he was killed by his brother, T'Cchaka for betrayal to their home.

It is also the substance that Ultron used to create Vision and his other centries (using the Mind Sceptor to manipulate Helen Cho into developing Vision. He later upgraded it to his body.

Shuri, the Princess of Wakanda, worked on vibranium to put it to good use. For example, several other things, like T'Challa's Pnather Habit was made of Vibranium.

Abilities

 * According to Steve Rogers, Vibranium is the strongest metal on Earth, being even stronger than steel. It is nearly-indestructible,
 * Steve's vibranium shield was able to withstand bullets, even Thor's hammer, Mjolnir, which sent Thor flying backwards, Tony Stark's repulsor beams as it richochets off his shield and to a Chitauri. It can be thrown very far, and can ricochet from multiple surfaces and is wind resistent.
 * Vibranium is also magnetic, as the shield Steve had could return to his arm via a magnetic devise.
 * The Vibranium is also used by Wakandans, who put it in their clothes, use as tattoos, and it helped advance the technology in their country.
 * However, it is only nearly indestructable, as it is able to be penetrated. For example:
 * With the combined forces of Tony, Wanda, and Vision were able to destroy Ultron's body
 * Black Widow's Bite, a taser used by Natasha was able to electrocute and slow down Black Panther.


 * Is unstable when transported in high speed
 * Thanos was able to penetrate Vision's vibranium forehead.

Trivia

 * In the comics, Ultron was not made of vibranium but of adamantium