Orichalcum Ore

Orichalcum Ore is a magenta-colored Hardmode Ore which can replace Mythril in a given world. Like all Hardmode Ores, Orichalcum is generated upon destruction of a Demon Altar with a Pwnhammer.

Trivia
Orichalcum is possebly a kingdom hearts refrence as in the first game there is a super powerful ore that is said to make the ultima weapon and the ores name is Orichalcum.
 * Orichalcum is named for the fictional metal described by "Plato" in his work  "Critias", where it is mined only in the legendary lost city of "Atlantis". It is suspected to be an alloy of copper and iron used for ornamentation.