New player – never played something like this

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Man this is great. It's absurdly scary and... beautiful. The scale of everything just feels right. I love the graphics, they remind me of the eerie silence of an empty Counter Strike Source map. Died a couple of times due to idiocy and had some incredible stand-offs. I have a question though: I understand that there are PvE servers for a more relaxed yet challenging play. How do they work? Is it possible to kill other players (would like that to be impossible)? Are there servers with Quests, ...