Demons

Demons are found in the hottest and most excruciating islands, molten floating furnaces that miraculously produce the basis by which other islands come about. Demons are amongst the most magically attuned species of monsters, and capable of regulating their own magical output to a certain degree, absorbing vast amounts of magical energy and using it to ignite the essence within their bodies into pyrocatalysmic displays of power. Rather than making them saner however, this seems to make even tame Demons rather crazy by most people's standards. Their essence is used in heating and fueling applications.