The Luminite Ore is dropped from the Moon Lord. It's the rarest ore in the game, and is used in crafting the final suits of armor. Ore is used to make Luminite Bar.

Looking to get the best Terraria armor? If you’ve been playing for a while, you probably have a good idea of what kind of armour you like, as well as what style of play suits you. Instead of a ...

A Luminite Bar is the final type of bar as of update 1.3.