D&D General worldbuilding around expedition to the barrier peaks

[Shades of Eternity]

I was listening to Greyhawk Grognard and he was grumbling how he thought it tainted the barrier peaks and made them assume it was just a place of tech.

so want to invert it.

lets build a fantasy world where the focal point is a space ship crashing on the planet

what was it like before?

What was it like afterwards.

 

[Zeromaru X]

Interested in this topic.

 

[Shades of Eternity]

To make it easy, this is the map before the space ship struck the planet.