Djinn

Sometimes called "arcane elementals," djinn appear as beings of pure smokeless arcane fire, possessing immense magical power. They are less likely to be malevolent than ifrits, but they are known to be mischievous tricksters. They are also far harder to summon than even other elementals. Once they are summoned, magi will go to great lengths to bind them to the mortal world, often within a vessel such as a bottle engraved with runes.