The Sergeant United Shield being thrown and bouncing off three Mimics, then parrying a Unicorn's attack.
The Sergeant United Shield is a Hardmodeboomerang that is rarely sold by the Traveling Merchant for 35 GC. When thrown, it homes in on enemies within 50 tiles and will attempt to hit up to five enemies before returning to the player, but loses 20% of its damage for each enemy struck.[1].
While holding this weapon and equipping a shield (including the Sergeant United Shield itself, while it is not being thrown), the player is granted the ability to parry incoming damage. Pressing ⚷ Open / Activate will cause the player to raise the shield and brace for the next attack. When timed correctly, up to 0.33 seconds before taking a hit, the enemy's attack will be parried, which negates the contact damage being dealt to the player, deals 200% of the contact damage of the attacking enemy, inflicts a knockback value of 5 (Average), and grants the player 30 invincibility frames (60 with the Cross Necklace equipped).[2] Successfully parrying an attack also grants the Striking Momentbuff, causing the next melee attack to deal 500% or five times its usual base damage for the next five seconds. Alternatively, if the shield is held in place, 20 defense is temporarily gained; this lasts until the shield is once again lowered.
Its best modifier is Godly or Demonic. Both modifiers increase the average damage output by the same amount. However, Ruthless might be preferred if the player already has very high critical strike chance.
Notes
It can only hit an enemy once per throw.
In order to parry an attack, the enemy must collide with the shield before hitting the player.
A small particle effect and the sound for restoring mana indicates when the parry can be used again.
Due to its high velocity and slow use time, the Sergeant United Shield will usually return to the player a few seconds before it can be thrown again.
The damage dealt by parrying an attack is decreased by banners (25% in Classic Mode or lower, 50% in Expert Mode or above), rerolled inversely by luck (having negative luck will give a chance to increase incoming damage, and increase reflected damage as a result) and is capped at 1,000 damage.
The Sergeant United Shield's parry ability can only be used to parry contact damage from enemies (including enemies that ignore dodges like the Dungeon Guardian). Fall damage, lava damage, enemy projectiles, and traps will still harm the player.
It can, however, reduce damage from these sources with the 20 defense gained while pressing the ⚷ Open / Activate button.
Desktop 1.4.4: Knockback increased from 0 to 2, also allowing it access to better reforge modifiers.
Desktop 1.4.2: Fixed an issue where Sergeant United Shield was accidentally showing accessorydyes under some specific circumstances, even though it is a weapon.