I was thinking of the difficulties in making a realistic Human Fortress mod, one of which is that humans are just as good as dwarves at digging. I've come up with something that might work to correct this, and thus make the experience significantly different:
When a human miner digs out a square, they have a chance (perhaps related to skill) to accidentally mine the adjacent one even if it isn't designated, that tile collapsing into rubble and dangerous dust. This will have a number of effects:
- Humans will be unable to easily create even-shaped underground rooms- unlike dwarves who can easily shape the raw stone into the final product, humans have to rebuild areas that have been misdug.
- Humans will be much more likely to injure themselves as poorly-mined areas fill with dust.
- Humans will thus dig smaller areas, usually only basements and mineral-specific mines or quarries.
Of course, this could also work as a dwarven impediment as well. It would make legendary miners, who never collapse walls, more valuable (instead of being actively annoying to those who want less stone.) If that was the case, Dwarves may have an innate bonus to mining skill (though I hesitate to suggest such simple DnD-inspired racial delimiters. Perhaps faster skill growth or something.)
The biggest problem is that this will make fractal and thin-walled fortresses more difficult, but when it comes down to it, shouldn't intricate structures BE more difficult?
Duck Duke 2.0: That's a good idea. I wasn't thinking that full cave-ins would be caused, but it makes sense that shallow areas would be safer.