Power of Existence(存在の力Sonzai no Chikara) is the basic essence of the world. It comprises practically every living and non-living thing , and is also needed by Crimson Denizens and Flame Haze alike. It is usually undetectable by humans unassisted and Crimson Denizens and Flame Haze are the only ones who can usually see Power of Existence, which usually comes in the form of a blue flame (anime only).