[Serph nods. It was always raining, but indeed, people simply come into existence with the rain. He doesn't really remember what that felt like. Maybe because back then, he didn't feel, so the event probably didn't seem like something he ought to note the experience of. Do people normally feel something towards their life's beginning?]

We met the requirements for entry. [Which means, yes, he did indeed kill everyone who got in his way.] So we passed through the gates to Nirvana.

[It ended up being a bit more complicated than that but that is essentially what happened. So yes, he has been to Nirvana and quite frankly...]

It sucked. The black sun's rays turns humans to stone. They either live in domes or underground.

[But he has a thread of discussion that he wants to pursue, so he continues-]

Those of my world have memories of lives we didn't live. They come from those who died in Nirvana.

[And to stave off a follow-up question, "How do you know?" he adds]

One of our comrades had memories of a child [even though there were no children] who we met in Nirvana.