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I want to wall off the edges of the first cavern layer to prevent Forgotten Beasts from spawning there. I've observed that after I built a wall around the first set of walls that creatures starting spawning on top of the walls. So do Forgotten Beasts spawn at any of the following places on the edge of caverns:

  • On top of man (dwarf?) made structures
  • On top of surface of water
  • Underwater
  • Open Space, for flying Forgotten Beasts
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If you walled off the edge -1 square to leave space for the Beasts to spawn "legally", you might avoid this problem. Have you tried that? –  SevenSidedDie Aug 20 '11 at 3:14
    
@SevenSidedDie Good idea, but it won't do for flying Beasts, and if they can spawn underwater / in mid-air then this won't do much good –  Private Pansy Aug 20 '11 at 3:27
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2 Answers

You won't be able to prevent FBs from spawning. Basically, what I recommend is to think of, and treat, the caverns exactly like you think of the surface: as fundamentally an area outside your fortress that you need to manage your fortress's interface with in order to achieve security.

Then it proceeds naturally that the measures that you employ to be secure with dragons arriving on the surface are the same measures employed to be secure with flying FBs arriving in the caverns.

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Though it may bear mentioning that Dragons in DF can't fly. Rocs, however... –  Raven Dreamer Aug 25 '11 at 17:19
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Walling off the ground-level edge isn't enough - you need to wall off the entire open spaces on the map, which usually includes a few spaces of 'open air'.

Given that this is impossible to do via the map edge constructions currently available (statues / bridges), you might be better off walling in your dwarves, rather than the entire cavern itself.

Map-edges touched by water are fair game for most forgotten beasts.

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