Forged by the death of the third Daemon Lord. A giant axe. So much so that the Orkin hero weilding it required two hands to heft it’s immense size. Having struck down the third Daemon Lord the axe and the weilder burned. For them the flames were cool, the axe and weilder spared. Everything else in the two mile sphere wasn’t so lucky. To this day the still burning 2 mile crater is known as bolkin bowl. The third artifact too still burns, becoming weightless in the process. This not being the only transformation the axe underwent.
As the weilders experience with the infernal axe grows it’s flames grow more potent. The fires at bolkin bowl assumed to burn through time and there has been at least one function where the axe burning through space itself, being summonable by its current weilder through any flame. What seperates the Infernal Axe from other artifacts is how picky it is about it’s weilders. Weilders not only having to be human half breeds but apparently approved of by the axe itself. Any weilder deemed unworthy having to deal with not only the flames but also the axe’s true weight. In most cases the current weilder of the infernal axe can pass on the axe to another. Allowing the infernal axe to choose a weilder among the allies of the weilder if and when they die is also another common scenario. Be it fortunate or otherwise the one case where all the members of the group associated with the infernal axe were struck down the infernal axe remained untouchable until recovered by the previous weilder. The axe presumably having a sense of loyality considering the evidence of villans (half human half accursed) being present.
The limits as to what the Infernal Axe can burn, much alike with other Artifacts, is completely unknown but has proven itself to be capable of burning abstract consepts such as greif by particularly adept weilders.