The Darkest Storyline

Between Halo Combat Evolved through Halo 4 ( or add Halo 5 if you think), which of these games has the darkest storyline? In my opinion, Halo Combat Evolved has to be it for it’s introduction for the Floods, some of it’s maps, and most importantly it’s soundtrack. The soundtrack adds more mystery and spookiness through the story. That’s my opinion, I want to hear your opinions

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> Between Halo Combat Evolved through Halo 4 ( or add Halo 5 if you think), which of these games has the darkest storyline? In my opinion, Halo Combat Evolved has to be it for it’s introduction for the Floods, some of it’s maps, and most importantly it’s soundtrack. The soundtrack adds more mystery and spookiness through the story. That’s my opinion, I want to hear your opinions

I really can’t decide, close call for Halo 4 and CEA. Halo 5 if I include it.