Vortex Fragment

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

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

Trivia

 * Items crafted from Vortex Fragments have a similar color scheme to the Moon Lord and the Luminite Bars.
 * The item name used in most spoilers prior to its introduction was Blackhole Fragment.