The advantage Orichalcum has over Mythril is its unique color. Mythril Ore does not stand out as much and bears resemblance to other ores and blocks.
Trivia[]
In real life, orichalcum is a legendary metal described by the Athenian philosopher Plato in his work Critias to have been mined in the lost city of Atlantis. It is suspected to have been a sort of alloy involving copper.
The placed sprite looks like waves of a thick ooze flowing down a vertical surface. This would match the theme of orichalcum’s “brick” variant being Bubblegum Block.
While the in-game color is magenta, orichalcum is speculated to be a more reddish hue.