Psycho Knife

Type	Weapon
Damage	85 (Melee)
Knockback	3.5 (Weak)
Critical chance	4%
Use time	8 (Insanely fast)
Tooltip	Allows you to go into stealth mode
Rarity
Sell	10 GC
Research	1 required
Use	https://terraria.wiki.gg/wiki/File:Item_1.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Psycho Knife in use. Note the increased damage after stealth mode, and massively increased use speed.

The Psycho Knife is a Hardmode, post-Plantera melee weapon that has a 1/40 (2.5%) / 79/1600 (4.94%) chance to be dropped by the Psycho during the Solar Eclipse event. When holding the Psycho Knife and standing still, the player will quickly enter stealth mode, causing them to turn almost completely transparent, move much more slowly, and no longer be targeted by enemies.

Stealth mode is engaged gradually over the course of about one second, during which the weapon's stats are steadily boosted up to the following values:

+300% damage (340 base damage)
+30% critical chance (34% base chance)
+100% knockback (7 (Strong) base knockback)

Stealth mode is disengaged when successfully attacking an enemy, when switching to a different weapon or when riding a mount. Swinging the weapon alone does not cancel stealth, nor does walking or flying. Standing still again afterward re-engages it. Moving or swinging the weapon during the one-second transition period, however, will cancel stealth mode.

Its best modifier is Legendary. Due to rounding, the Light modifier gives the same speed bonus as Legendary, with fewer other bonuses.

Notes

The Psycho Knife only receives 33% of any melee speed bonus.
At a base level, the Psycho Knife is tied with the Fetid Baghnakhs as the fastest melee weapon in the game. However, given the Baghnakhs' 75% melee speed bonus reduction compared to the Psycho Knife's 66% melee speed bonus reduction, the Psycho Knife is capable of reaching higher speeds overall, thus making it functionally the fastest melee weapon in the game.
The stealth mode that is activated by the Psycho Knife is somewhat similar to that of the Shroomite armor's set bonus, in that both stealth bonuses activate while remaining still for a period of time.
- However, more akin to Vortex armor, moving will not deactivate it.
The stealth-mode horizontal speed reduction even applies when using wings to fly. Vertical flight speed, notably, remains unaffected.
All melee weapons are affected by the increased stats from stealth mode; however, this effect cannot be seen in-game, as switching weapons cancels the stealth bonus.
The dash attacks that can be used with the Solar Flare armor's set bonus and the Shield of Cthulhu gain the damage bonus from the Psycho Knife's stealth.
Other players can see a player that is using Psycho Knife's stealth if they are missing health, as the health bar will be shown above their head.
If the player enters stealth, holds the attack button to autoswing their Psycho Knife, and uses the Quick Mount function, they will retain stealth while using their mount until an enemy is hit by the weapon or they stop swinging.
Enemies which fire projectiles and certain flying enemies will target through stealth.
- Projectile firing enemies will not, however, chase the stealthed player.

Tips

By gaining the Striking Moment buff from the Brand of the Inferno(Desktop, Console and Mobile versions) before switching to the Psycho Knife, one can easily deal over 2,000 damage in a single hit if it is a critical hit.
- This damage can be drastically increased to well over 7,000 in a single hit when utilizing banners in Expert Mode alongside damage boosting gear such as armor and accessories, making it one of the highest damaging setups in the game.
Dash accessories or armor (Desktop, Console and Mobile versions) (e.g. Shield of Cthulhu, Master Ninja Gear, or Crystal Assassin armor(Desktop, Console and Mobile versions)) can be used to great effect to move faster while in stealth mode.
- A hook can be used to achieve similar effect. Grappling the floor in front of the player and quickly jumping will boost the player's movement speed significantly.