Psycho Knife

The Psycho Knife is a melee weapon 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 slower, 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:
 * Damage +300%: 280 (from 70)
 * Critical chance +30: 34% (from 4%)
 * Knockback +100%: 7 "Strong" (from 3.5 "Weak")

Moving or swinging the weapon during the transition will cancel stealth mode.

Stealth mode is disengaged when successfully attacking an enemy or when switching to a different weapon. Swinging the weapon alone does not cancel stealth, nor does walking or flying. Standing still again afterward re-engages it.

Its best modifier is Legendary.

Trivia

 * This weapon is a reference to the 1960 movie Psycho.
 * The weapon's mechanics may also be referencing the Spy Class from Team Fortress 2, in which the Spy can cloak and become invisible as well as use his knife to instantly kill other players.

History
Couteau de Psycho