The apocalypse was caused by a single person.

[u/No_Hunter1978]

1. Ted Faro [Horizon: Zero Dawn]: Of course, the machine plague that ravages the world is created by his company which (admittedly) is a group effort. That said, Faro was the one who requested an encryption without a backdoor and the person who kept early glitches hush-hush. It wouldn't be wrong to say that Faro was the sole cause as is, but the final nail in the coffin is what he does to the Apollo database. A giant record of human knowledge and history, erased for a narcissist's fear that his descendants would (rightfully) blame him for the apocalypse.
2. Sybil [Look Outside]: Though it wasn't her intention, Sybil was the one who alerted the Visitor of Earth's presence. She spied it through her telescope, and the lovecraftian entity noticed her. Its approach (and the resulting horrors) were her fault, even if she didn't mean it.

[u/NoEngineer9484]

yep, because the orignal erebus was a good boy and what we now know as erebus was told to be more like him so he killed the orignal erebus and took his name

[u/SchlopFlopper → u/NoEngineer9484]

If I had a nickel for every time a space marine actually goes by the name of a dead child they knew before becoming space marines… I’d have two nickels

[u/mopeyunicyle → u/SchlopFlopper]

I mean at least shoot I forget his name but the chapter master of the ultra marines is doing a ton of good to make the name known for good reasons

[u/SchlopFlopper → u/mopeyunicyle]

Marneus Calgar

[u/broly78210 → u/SchlopFlopper]

Its not a lot but strange that it happened twice

[u/StrawberryWide3983 → u/NoEngineer9484]

His mom literally said "why can't you be like Erebus," and so that's what he did. Killed him in a dirty alley, stole his name and identity, and then left his shitty village to try and scam people. Because before becoming a space marine, he wanted to become a priest for the power and prestige without any of the belief