1st - I have an idea that, at some planets,inside of them ,in the ground deep to have a broken spaceship or an old ancient colony or an ancient base. 2th - The devs said ,that there's going to be meteors, that are going to be arenas.I'm having, the idea that the meteor may had being crashed into a ancient space ship. 3rd - My 3rd idea is that the dev can add some ancient monsters .They can be armored monsters or golden or crystal ,and they can be equipped with guns or with swords.
Not a bad idea. Incidentally I started a thread on a slightly similar idea here, called Worlds within Worlds.
You might want to continue this thread separately anyway, because it is significantly different from my own idea.