The Quackling Staff is a craftable summon weapon. It spawns a Quackling minion to aid you in battle by firing aquatic bolts that act similar to that of the Water Bolt. Like other minions, summoned Quacklings are invincible and follow the player for an unlimited amount of time, unless the player dies, summons a replacement minion, or cancels the buff.
Its best modifier is Ruthless. The Mythical modifier provides the widest array of stats bonuses, but these primarily affect the initial summon rather than the resulting minion. Additionally, Minions cannot deal critical hits. The only significant advantage a Mythical Quackling Staff has over a Ruthless one is knockback.