Which TTRPG system is this for?
System-Agnostic.

What Stellar Phenomena did you use?
stellification process

Did you participate in Hard Mode? Which extra rules did you use?
Yes.
1. Only two pages.
2. No graphics besides ASCII and normal docs signs. There is one exception - I put a logo of the group that helped me but this is not a real 'part' of the module.
3. There is a hidden twist about hidden civilization. I hope you will like it.