The Toxic Razorknife is a Pre-Hardmode weapon that acts much like its vanilla hardmode counterpart, the Vampire Knives. It can be Purchased from the Knight for 10 Gold.
While it is a great weapon, the projectiles have a larger hit box than it’s counterpart. This makes it hard to shoot in areas with low ceilings, downward from a ledge, or in very confined spaces. It is best used in large open spaces with little to no tiles in front or above the player.