Added to my fresh copy of DF (with the exception of my two additions ^) I've added all of the megabeasts (except FSM) and this is how it came out.
I noticed a lot more lag than I usually get and world gen was slow. There was a lot more death than usual, ending up with over 3000 people left at the end. World gen stopped at the year 213. Here is the first (useless) screenshot:
After the offloading, I immediately went to legends mode. Here is another screenie:
The first page was every single megabeast and a mudman god. The three fail megabeasts were the fat demon (d. 1), the ruin golem (d. 2), and the creepy baby (d. 6).
Ew...
The Permanent Incest...
The Brain Demon was pretty successful... until he died in 49...
I also noticed something odd about the diamond demon...
The bastard hates kobolds... -.-
Next I looked at the hell cat.
I think it had 41 kills.
Then the fluffy bunny, one of the few surviving megabeasts.
The next surviving one was pwny and it did
some pwning...
It has nearly two pages of enemy civs.
Without further adue? Now, here is the list!
I was going to play around in adventure mode but then I noticed my mod failed.
I mean, there were no elves!
I checked fort mode and saw that the surviving retreats were controlled, fully, by humans or dwarves! YAY! THE WORLD HAS BEEN PURGED OF SCUM!!!
F*CK YOU TREE MANDATES!!