The Psycho Knife is a knife dropped by the Psycho during a Solar Eclipse. It allows the user to stealth when standing still with the knife. While stealthed, you can move at a reduced speed and the Psycho Knife does about 4x the damage it normally does. You come out of stealth mode when you are damaged or switch weapons.
- Although this weapon's stealth mode makes all other melee damage quadrupled as well, it cannot be utilized as switching weapons cancels stealth mode. The Solar Flare Armor's dash move can however be used in stealth mode, and deal four times more damage.
- Although the stealth mode allows movement, it is quite dangerous to use against enemies, as the knife has very short range, which can lead to the player easily taking damage from close combat.
- Added to the game.