There is a twitch promotion allowing you to get Purple Footprints EffectPurple Footprints EffectBoots Modifier
Stack Size: 20Adds purple footprints to a pair of boots.Right click this item then left click some boots to apply it., Purple Weapon EffectPurple Weapon EffectWeapon Effect
Stack Size: 20Adds a Purple effect to a weapon.Right click this item then left click a weapon to apply it. and Purple Portal EffectPurple Portal EffectPortal ModificationThis character's portals use a purple effect.Right click this to set or remove your Portal effect. if you have twitch prime.
Infernal BlowAttack, AoE, Melee, Fire
Mana Cost: 6
Cast Time: 1.00 sec
Critical Strike Chance: 5.00%Hits the enemy, converting some of your physical damage to fire damage. If the enemy dies soon after being hit, they will explode, dealing fire damage to nearby enemies. The damage from this explosion cannot be reflected. Requires a Sword, Axe, Mace, Staff or Unarmed.Per 1% Quality:
0.5% increased Area of EffectDeals (130-160.4)% of Base Attack Damage
50% of Physical Damage Converted to Fire Damage
Base duration is 0.5 seconds
Explosion deals base Fire Damage equal to 10% of the corpse's maximum LifePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.Acquisition
Tracing a series of fiery runes on the length of their weapon, the caster prepares to unleash the Infernal Blow. Once imbued with fiery energy, the weapon discharges the moment it strikes any enemy. Infernal Blow burns anything struck with searing Hellfire, incinerating bone, flesh and armor. Perhaps the deadliest property of the enchantment lies in what follows a fatal hit. Any foe slain by Infernal Blow will explode in a violent conflagration, showering anything nearby with flame, igniting and killing with abandon. Masters of the Infernal Blow delight in watching enormous chain reactions of detonating victims.Description on the official Path of Exile website 
Infernal Blow is a melee attack skill that converts half of Physical Damage to Fire Damage, applying a special debuff to enemies. If the enemy dies while affected by this debuff, they will explode, dealing fire damage to nearby enemies. Requires a Sword, Axe, Mace, Staff or Unarmed.
Skill Functions and Interactions
Damage conversion: Like all converted damage, the fire portion of Infernal Blow's damage will be modified by both fire damage increases and physical damage increases.
Duration: If the debuff caused by Infernal Blow is still active when the monster dies, it will explode even if Infernal Blow was not the killing blow. That makes this skill very effective with Melee Splash.
Explosion: The fire damage of the explosion will be 10% of the corpses' former maximum life, modified by elemental and fire damage passives and item mods. The explosion is neither an attack or a spell, so in particular it is not affected by modifiers to melee. The explosion damage cannot be reflected. Each explosion can roll a critical strike independently from the Infernal Blow attack and has a 5% base critical strike chance. While in a party, the explosion ignores the increased life added for each player beyond the first and treats the monster's life as if you were solo.
Monster Types: Magic (blue named) and rare (yellow named) monsters can be exploded, but unique monsters (orange named) cannot be.
Weapon Elemental Damage: The explosion will not be affected by increased elemental weapon damage or weapon fire damage, but the fire portion of the initial attack will be.
Gem level progression
This skill is not given as quest reward.
Vendor rewardThis skill can be bought at the listed npc vendors after completing the following quests:
|Enemy at the Gate|
|A Fixture of Fate|
Related helmet enchantments
The following helmet enchantments affect Infernal Blow:
|EnchantmentInfernalBlowDamage1||66||25% increased Infernal Blow Damage|
|EnchantmentInfernalBlowDamage2||75||40% increased Infernal Blow Damage|
|EnchantmentInfernalBlowPhysicalDamagePercentToAddAsFireDamage1||66||10% of Infernal Blow Physical Damage gained as Extra Fire Damage|
|EnchantmentInfernalBlowPhysicalDamagePercentToAddAsFireDamage2_||75||15% of Infernal Blow Physical Damage gained as Extra Fire Damage|
|EnchantmentInfernalBlowRadius1||66||8% increased Infernal Blow Area of Effect|
|EnchantmentInfernalBlowRadius2||75||12% increased Infernal Blow Area of Effect|
- "Strength skills". Official Path of Exile website.
- Mark_GGG (February 3, 2013 5:35 AM). "Devs and other GD people - Kripps Death a good thing". Path of Exile Forum. Retrieved August 2, 2013.