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What other stuff? The visual effects, terrain and the weather system?

Here is your weather: https://assetstore.unity.com/packages/tools/integration/weather-report-plugin-62...

Terrain has several packages you could've used and the visual effects I'm not going to put the time into searching for them. Still, you are still welcome to claim that this is your own work and live in your own bubble.

I'm not claiming I did any of the visuals. I put it all together as anyone does with assets; as for a lot of scripting I did do myself.