Nebula Fragment

The Nebula Fragment is a Hardmode, post-Lunatic Cultist crafting material. It is one of the four Lunar Fragments, dropped from the Nebula Pillar during the Lunar Events in stacks of 12–60 /. Nebula Fragments can be used to craft Nebula armor, an end-game armor set that benefits all types of magic weapons, as well as Nebula-themed tools, weapons, wings, etc.

Crafting all items requires 121 Nebula Fragments and 68 Luminite Bars (272 Luminite), which necessitates defeating the Nebula Pillar at least 3–11 / times (note that the Nebula Fragment can also be crafted from the other fragments) and fighting the Moon Lord at least 4 /  times.