Pre-ch16 Bonus Theory

Before I hit the gas on further progressing ch16, I did want to try and double-check my work on something I've been thinking about for a while. Can anybody recall any lines of dialogue or info detailing when the Darchlight meteor landed? I've been thinking about it for a while, and I'm like 40-50% on this being the Torvenbyuen meteor. It kinda makes sense, right? It would've been filled with that red crystal, and on planet entry a lot of it turned into the black crystal that Variya used.

It makes sense when you think about what other things are made of black shards. The RGB gamer pillar that lets us access Zeight, for example, is constructed of black shard. If I have everything right so far, it must be that this material is what allowed Variya to create a system that could create new worlds entirely and that Darchlight must therefore be a Karmically important location. Some rule or standard probably exists that Karma's worlds must not generate events that would not lead to its own creation, which is why the 3rd Layer is a thing at all; as a result, Karma should also include the meteor in every world. This would go a long way to explaining the world overlap phenomenon.

The reason why I'm doubting myself is that I don't know how far underground Darchlight is. Is it really 3rd-layer-levels-of-deep? I could also be getting it backward, and that it's the property of the un-smelted red crystal that causes the world overlap in the caves. Also, I think I might have hallucinated a line stating that it only arrived a few decades ago, but I'm sure that's wrong. Anyway, let me know.