From HoNwiki

Nullfire Blade
Cost
3,300
Stats
+22/26 Agility +6/10 Intelligence Passive
Modifier
Exclusive modifier
Location
Morph Attack
Dota Counterpart
Diffusal Blade

Contents 1 Recipe 2 On Use Effect 3 Passive 4 The More you know

Recipe

• Quickblade - 1000 Gold
• Quickblade - 1000 Gold
• Apprentice's Robe - 450 Gold
• Nullfire Blade Recipe - 850 Gold

Total price = 3300/4150 Gold

On Use Effect

• Target Enemy:

Removes positive buffs from target, and slows it by 80% initially, recovering to full speed over 4 seconds.

• Target Ally:

Removes de-buffs

• 20 second cooldown. Contains 8 charges.

Passive

Mana Combustion 26/36, deals Physical damage equal to 100% of the mana drained.

The More you know

• Upgrading Nullfire Blade will give the Nullfire Blade infinite charges.
• Nullfire Blade can not be used on a magic immune target.