AmuletOfManyMinions/Crest of Stardust

The Crest of Stardust is a post-Lunatic Cultist Hardmode weapon that summons a Stardust Squire to fight for the player. The summoned Stardust Squire will stick close to the player at all times, launching homing mini-Stardust Dragon projectiles towards the cursor while its item is in use. Once every 3 seconds while the squire is attacking, an additional mini-Stardust Guardian minion will be summoned, targeting enemies near the player and dealing the full damage of the weapon. Like other squires, the summoned Stardust Squire is invincible and follows the player for an unlimited amount of time, unless the player dies, summons a replacement squire, or cancels the buff.

Its best modifier is Mythical for the widest array of set bonuses, or Ruthless for the highest damage output.