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[Zalewa]

I've been toying around with the 'schnosm' cheat. It seems that the game has some unused content and a lot of test maps. Try teleporting to map index 210. It's a whole new continent filled with random jungle stuff.
Teleporting to map 211 gives you psychedelic graphics and a message about the main quest phase (I think) and then about Herras's status.

I was also curious when Rainer gets the second attack so I used ALT+F7 shortcut cheat to get him to the place where infinite Animals are spawned. Here's the result:

Oh, my...

Also, since Rainer is obviously the best character in the game, I used the ALT+F7 cheat to do this:

(the horror, the horror...)

Seriously now, regarding Rainer:
When I was younger I hated this character for being completely useless in combat but now I can see that he brings a lot to the plot and the story background.

And last, but not least:
If anyone ever wondered what happens if you ...

... kill the AI, here's the video:
http://www.youtube.com/watch?v=n5V-KcVcmXw

Game ending spoiler