Rainbow Gun

The Rainbow Gun is a Hardmode, post-Plantera magic weapon. It launches a rainbow beam that travels in a straight line for a short distance before curving downwards. The rainbow persists for 10 seconds, or until another rainbow is fired, and any enemy in or moving into its path takes 45 damage repeatedly, approximately 5 times per second. It is found in the Dungeon's Hallowed Chest, which must be unlocked with a Hallowed Key.

The best possible Modifier for this weapon is Mythical.

Physics

 * Fired vertically up, the beam will travel straight for approximately 65 blocks before curving.
 * Fired 45 degrees, diagonally, the beam will travel approximately 4 blocks before curving.
 * Fired horizontally, the beam will travel straight for approximately 35 blocks before curving.
 * Fired vertically down, the beam travels straight for a maximum of 750 blocks, then fades.
 * If fired at a perfect 90 degree angle up or down, the beam travels until it either hits a wall or reaches the end of the map (tested as of v 1.3.0.7).

Tips

 * This weapon will pierce infinitely until it fades, and is a great weapon against enemies with multiple segments; such as The Destroyer, as it will damage each section simultaneously inflicting tremendous damage. Because of this, it is potentially possible to defeat the Eater of Worlds or even The Destroyer with a single shot, given the player has appropriate gear and other preparations.
 * The Rainbow Gun is also exceptionally powerful against walking creatures or teleporting creatures. In the Hardmode post-Plantera Dungeon, if the player puts their back to the wall, and has only one passage leading into the room they are in, they can lay down a rainbow that eliminates every enemy that comes at them besides the occasional Cursed Skull or Paladin.
 * For the same reasons, the weapon is exceptionally potent against invasions.

History
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