This short blade weapon has limited range but comes out fast and can inflict fire damage.
The Heat Dagger is a dagger whose blueprint is exclusive to Alert missions. Specializing in Puncture damage, its signature trait is the ability to create a blast of fire when slammed into the ground. This combination of Fire and Puncture lets the Heat Dagger have utility against most of the Grineer, effective against both armored and light units.
If performing a ground slam with this weapon equipped, Valkyr in Hysteria will use the Heat Dagger's radial flame attack.
When equipped without a Stance mod, the Heat Dagger adds a 4th lunging stab on its normal attack combo, which propels the Warframe a good distance forward, which is useful for catching up to moving enemies. It also has a 100% chance of inflicting Slash bleed proc on contact. This effect is lost if one uses the Pointed Wind stance, which replaces the lunge with a sweeping slash.
If the lunge lands behind an unalerted enemy, a stealth attack will be performed instead.
Jump attacks will make the Heat Dagger emit a visible ring of fire upon slamming the ground. This visual trait is shared with other Heat weapons like the Heat Sword and Dual Heat Swords.
The Heat Dagger received a visual change in Update 16.5, giving it a faded color scheme with texture animations similar to those found in Prisma weapons. Its visual model was also sharpened and lengthened to further resemble the Heat Sword.
In the Red Veil section of any relay, one of the torturers behind the leader is seen wielding this weapon (possibly) to interrogate the Grineer subject.