I've been playing with generating other ages (in singleplayer) and I've not got it right yet. The last world I created was a disaster and what is worse is I built a portal back to the overworld then decided to explore for a bit and a meteor took out the portal...
I feel like I'm trapped in an episode of Stargate...
Good thing it was a new map and I've not lost anything important haha... That's what you get for playing with portals rather than just using the linkbook...
(I was learning portals too)
Lesson learned...