Perennial Ore

"Energized plant matter has formed in the underground."

Perennial Ore is a Hardmode ore which generates in Dirt and Stone Blocks in the Cavern layer after Plantera has been defeated, and is used to craft Perennial Bars at an Adamantite Forge or a Titanium Forge. It requires at least a Pickaxe Axe or a Drax to mine. It is also dropped by Perennial Slimes.

Trivia

 * In botany, "perennial" plants are plants that live for more than two years.