Psycho Knife

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Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.
Psycho Knife
  • Psycho Knife item sprite
Autoswing
Stack digit 1.png
Statistics
Type
Weapon
Damage85 (Melee)
Knockback3.5 (Weak)
Critical chance4%
Use time8 (Insanely fast)
TooltipAllows you to go into stealth mode
RarityRarity level: 8
Sell10 GC
Research1 required
Sounds
Use
  • Internal Item ID: 3106 (Desktop, Console and Mobile versions)
Obtained from Obtained from
Classic Mode.png Classic
Expert Mode.png Expert
Master Mode.png Master
EntityQty.Rate
Psycho(Desktop, Console and Mobile versions)Psycho.gif Psycho(Desktop, Console and Mobile versions)12.5%4.94%
The Psycho Knife in use. Note the fast use speed, and the increased damage in stealth mode.

The Psycho Knife is a Hardmode, post-Plantera sword. When holding the Psycho Knife and standing still[1], the player will quickly enter stealth, causing them to turn almost invisible, move much more slowly, and no longer be targeted by certain enemies' projectile attacks. The Psycho Knife has a 1/40 (2.5%) / 79/1600 (4.94%) chance of being dropped by Psychos during the Solar Eclipse event.

Stealth is engaged gradually over the course of 0.83 seconds, during which the player gains several stat boosts that linearly increase to the following values:[2]

As a result of the aggro reduction while in stealth, enemies will prefer to target other players, and many kinds of enemies will not chase after the player while they are not using items (see Aggro § Target chasing for details). Stealth mode additionally prevents Fighter AI and Flying AI enemies from firing projectiles at the player while they are not using items.

Stealth mode is deactivated upon hitting an target[3], switching to a different item, riding a mount[2], or taking damage[4]. Swinging the weapon alone does not cancel stealth, nor does moving. However, moving or swinging the weapon before stealth mode is fully engaged will quickly deactivate stealth.

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.[5]
  • If stealth mode is deactivated by hitting a target, the player cannot enter stealth mode again in the following 0.25 seconds.
  • The player's melee critical strike chance cannot be increased beyond 100% by the Psycho Knife's stealth mode bonus.[2]
  • The Psycho Knife's stealth mode cannot be stacked with that of Shroomite or Vortex armor. If both items are used, the player can only receive stat changes from the Psycho Knife's stealth mode as it has the highest priority.
    • The only exception is the knockback bonus, which is always granted as long as the player is in stealth mode. For example, when using the Psycho Knife with the Shroomite armor, the player will gain +100% melee knockback and +50% ranged knockback at the same time when in stealth mode. However, this has little use in actual combat.[6]
  • NPCs will not attempt to "talk" to (i.e. show emotes to) players that are in stealth mode.[7]
  • The stealth mode horizontal speed reduction applies when using wings to fly horizontally. Vertical flight speed is unaffected.
  • Solar Flare armor's and the Shield of Cthulhu's dashes gain the damage bonus from the Psycho Knife's stealth.
  • In multiplayer, the health bar of a player will fade out as they enter stealth mode.

Tips

  • By gaining the Striking Moment buff from the Brand of the Inferno before switching to the Psycho Knife, one can easily deal over 2,000 damage in a single critical hit.
    • This damage can be drastically increased to 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 items and hooks can still be used in stealth mode without canceling it, allowing faster movement.

Trivia

  • If buffed correctly, the Psycho Knife can achieve more DPS than the Zenith.
  • All melee weapons are affected by the increased stats from stealth mode; however, this does not have any effect in actual combat, as switching weapons cancels the stealth bonus.

History

  • Desktop 1.4.0.1:
    • Damage increased from 70 to 85.
    • Use time decreased from 20 to 8.
    • Now only gains 33% benefit from increased melee speed stats.

References

  1. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, method Update() in Terraria.Player.cs. The actual condition is that the player's horizontal and vertical movement speed is less than 0.1 pixels/tick.
  2. ↑ 2.0 2.1 2.2 Information taken from the Desktop version Desktop 1.4.4.9 source code, methods Update() in Terraria.Player.cs and ItemCheck_OwnerOnlyCode() in Terraria.Player.cs.
  3. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, methods ApplyNPCOnHitEffects() in Terraria.Player.cs and ItemCheck_MeleeHitPVP() in Terraria.Player.cs.
  4. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, method Hurt() in Terraria.Player.cs.
  5. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, field Sets.BonusMeleeSpeedMultiplier in Terraria.ID.ItemID.cs.
  6. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, method GetWeaponKnockback() in Terraria.Player.cs.
  7. ↑ Information taken from the Desktop version Desktop 1.4.4.9 source code, property CanBeTalkedTo in Terraria.Player.cs.
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