Now it said I needed something to venture out into Earth but which I won't mention but where can I find it? I found it on the uhs hints website. If anyone can give me some spoilers, that'd be great. Okay, thanks.

It's been a while but I believe this involves going to the ice caves. Access can be found at one of the top levels, and if I remember correctly its close to where you escape the initial goblin dungeon. You have to be able to fly (levitate?) in order to get there.

You can't venture to the surface really. There is a double door next to the Yellow Tulip and the Human Outpost on level one which leads to this, and only King Lunshire has the key (IIRC). Not much to see really but a cut scene and a prompt for a reload.

Yeah what Miles_Acraeus said. You'll have to kill Lunshire to get the key though, but there's really nothing much to see.