|This article is about the Hardened Blade. You may be looking for the Survival Knife or the Thermoblade.|
In general, it can be used as a tool for harvesting or defense.
It does more damage than the Survival Knife but less than the Thermoblade.
If a Bleeder latches onto the player's arm, the player can use the Hardened Blade to stab the Bleeder.
- Markings on the Hardened Blade indicate that it was made by "Alterra Arms Incorporated". Alterra is a corporation also known from the game Natural Selection 2, which was developed by Unknown Worlds Entertainment.
- Striking an object makes a small blue flash appear from the Hardened Knife.
- The Hardened Blade is the only weapon capable of killing a Reaper Leviathan. It takes ~192 hits. It is advised to bring a Stasis Rifle while attempting this.
- The former name for the Hardened Blade was the Diamond Knife.
- The Hardened Blade once had durability, but it was removed due to it being deemed useless.