Nightglow

The Nightglow is a Hardmode, post-Plantera Magic weapon dropped by the Empress of Light. When fired, four rainbow crystals emerge from the player and home in on nearby enemies. Each of the rainbow crystals can pierce enemies and hit multiple times, resulting in high potential damage. However, since they spawn in random directions from the player and are destroyed if they collide with obstacles, not only can it be difficult to use this weapon in enclosed spaces, it can also be difficult to damage enemies from a distance when there's a chance of the projectiles colliding with something.