Terraria (Wiki): Nimbus Rod

The Nimbus Rod is a magic weapon that summons a Nimbus Cloud to the cursor’s location or upon colliding with a solid block, spawning damaging rain projectiles for 5s. The spawned Cloud lasts for 5m (desktop, mobile, console) / 1m (3DS, old-gen consoles). Moreover, it can travel through open doors, platforms, and liquids unhindered. The Nimbus Rod is the stronger counterpart of the Crimson Rod.   The Nimbus Rod can summon two Clouds in total. Attempting to use the magic weapon again will remove the oldest Cloud.   In desktop, mobile, console, the spawned Cloud can damage up to five enemies. Meanwhile, an infinite amount of enemies can be damaged in a straight line in 3DS, old-gen consoles.   The Nimbus Rod could benefit from Demonic (best in 3DS, old-gen consoles) or Deadly Modifiers for the best damage. Mystic is also a good alternative for conserving mana.    The magic weapon synergizes with Sky Fracture, Staff of Earth, and Stellar Tune to enhance the cloud projectile’s critical strike chance.   During combat, one can farm coins using the Nimbus Rod near the door, damaging enemies trying to break in. The magic weapon also shines the most against enemies with a large hitbox effective for 5m (desktop, mobile, console) / 1m (3DS, old-gen consoles). Each raindrop will also trigger bonuses while wearing armor sets from Spectre armor and the like.