What is the strongest metal in the Marvel Universe?

What is the strongest metal in the Marvel Universe? Proto-Adamantium is the strongest metal in the Marvel fictional universe. Still, despite this status, the material of which Captain America’s Shield is made is still a big mystery in the narrative continuity of Marvel’s stories.

Proto-Adamantium is the strongest metal in the Marvel fictional universe. Still, despite this status, the material of which Captain America’s Shield is made is still a big mystery in the narrative continuity of Marvel’s stories.