Black fog



The "Black Fog" (as named in Metroid Prime: Episode of Aether) is a gaseous form that Samus Aran often encounters during her mission. It is the only way that an Ing can survive on light Aether, and it is used to turn a random creature(s) into a Darkling. Despite the name, the Black Fog is actually purple. Samus is unable to prevent the fog from reaching whatever creature, and she will be forced to fight it in its new Darkling form.

In Episode of Aether, the Federation Marines report that a "Black Fog" had possessed the Splinters attacking them and so they were now invincible, making it easy for all but four of them to be killed. Samus finds one of these being attacked by the Alpha Splinter and intervenes, managing to kill it. The Marine urges her to finish it off before the fog comes, but she is too late. Initially unable to destroy the Darkling form, she finishes it off with an Overblast at point blank range.