|This article is about the Hardened Blade. You may be looking for the Survival Knife or the Thermoblade.|
If a Bleeder latches onto the player's arm, the player can use the Hardened Blade to hit the Bleeder.
- Markings on the Hardened Blade indicate that it was made by "Alterra Arms Incorporated".
- Striking an object makes a small blue flash appear from the Hardened Blade.
- The Hardened Blade was originally named the Diamond Knife.
- The Hardened Blade once had durability, but it was removed due to it being deemed useless.
- The Hardened Blade will be removed in the future.