Celestial Heart

The Celestial Heart is a Hard Mode item which allow the Elemental Bosses to spawn. It is craft able right after the death of the Moon Lord

Crafting
Crafted at:
 * 20 Solar Fragments
 * 20 Nebula Fragments
 * 20 Vortex Fragments
 * 20 Stardust Fragments
 * 20 Luminite Bars
 * 1 Celestial Signal
 * Demon/Crimson Altar.