Infernal Infernals are mindless giants of flame and fury , summoned by the warlocks ' Inferno spell . Falling to earth as green , molten meteorites , infernals exist only to destroy every living thing in their path . Though their lifespans are limited , the mighty infernals have been known to destroy entire cities before their energies dissipated back into the Great Dark Beyond . Construction . A large concentration of infernals can be found in Shadowmoon Valley . There are the ever present infernals attacking Alliance and Horde towns in the region ; they appear to be stockpiled at Legion Hold and launched by shivarra . The Deathforge provides details on how this variety is made . Denizens of the Cosmos . Dreadlords . Dreadlords are incredibly powerful demons who wield the powers of darkness and mental domination . The dreadlord marks the pinnacle of his dark powers with the ability to summon a fiery infernal . At his call , the infernal will streak down from the sky . The infernal , engulfed in searing flame , will then rise to do the dreadlord ' s bidding . Professions of the Cosmos . Warlocks . Warlocks were mages that delved too deeply into the roots of demonic power and can summon many demonic soldiers to destroy their enemies . The powerful Infernal is just one of these demonic soldiers . Speculation Section . Do Warlock Magics come From Infernals ? Warlock magics are demonic powers of entropy and destruction , which is a process - not a living thing . Warlock magics do not come from the living and warlock energy spreads like radiation , which means that warlock energy can seep into - and exist inside - structures . Structures infused with the demonic warlock magics seem to have a connection to demons such as infernals and , by extension , the Twisting Nether . And , presumably , warlocks can access the demonic power of infernals and pull infernals from the Twisting Nether by destroying those structures . Despite that fact , when asked if perhaps warlocks are harnessing their power from the Twisting Nether , the Blizzard Historian known as Sean Copeland stated , “ No , that ’ d be magi , IIRC . They gain power by the destruction of another source ( recall the undead warlock in original cinematic ) . " Additionally , he claims that demons contain fel magic but aren ' t the source , stating that the nature of this magic is created by destroying something else . It seems that Sean Copeland doesn ' t understand that fel magic is demonic and destructive . If anything , demons are constructs in a state where their own structures are being destroyed by their own energies , energies that are released from demons during that process . After he was asked how demons can be alive since fel magic is destructive , Sean Copeland stated , " it ' s magic ; ) " . As such , Sean Copeland is joking and should not be taken seriously . Infernal Abilities . Most - if not all - infernals have an immolation aura that burns everything it touches with fel fire . Most Notable Infernals . Kroshius must be defeated to obtain his Infernal Core , required by a warlock to receive the Inferno spell . RPG Section . " The creature is of tremendous size , its roughly humanoid and brutish form engulfed in sulfurous flames . " Infernals are hulking brutes engulfed in arcane fire , entropic manifestations that warlocks conjure forth from the Nether . Infernals burst through the planar veil to strike like entropic meteorites , devastating everything in their impact radius . The infernals then rise to smash any and all targets in the area . Ripped from the void and cut off from the sustaining energies of the Twisting Nether , infernals endure for hours , perhaps days at most . Still , they can wreak tremendous havoc in that time , acting as engines of pure destruction .