Infernal Fire is one of the most dangerous and chaotic types of magic there is. In fact, another name for it is Chaos Fire, but it is commonly called Hellfire.
In some ways Infernal Fire is considered even more dangerous than the Shadow and Madness of the dark realm. A barrier of light can stop the aforementioned in its tracks, but nothing, nothing is safe from hellfire. It burns everyone and everything, no exception, including the caster.