Celestial Towers

{I don't know much information about these pillars, so please add more information}

The Celestial Towers are the four towers (or pillars) that spawn in after the Lunatic Cultist is killed, in a stage of your world dubbed the Lunar Events. They can spawn in extremely inconvenient spots that are pre-determined, such as above your house. They spawn in unique enemies. Each tower has 10,000 health, but deal no damage of their own. The minions spawned from the towers will attack you, however. You have to kill 100 pillar-exclusive enemies to lower the shield protecting the pillar before you can actually damage it. Upon destroying all of the towers, the message "Impending doom approaches..." will appear at the bottom of your screen, the music will fade to nothing and, after approximately 1 minute, the Moon Lord will be summoned. Each tower has their own exclusive background. The four pillars are:
 * Nebula Pillar
 * Solar Pillar
 * Stardust Pillar
 * Vortex Pillar