Found a very big drawback in programming new FoW. You can't make a feat occur when there are, say 10 Slavers built. There's no UNITCOUNT for it, I can only count Buildings and such. Drawback is big, and probably with no workaround.
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Solver, WePlayCiv Co-Administrator
Contact: solver-at-weplayciv-dot-com I can kill you whenever I please... but not today. - The Cigarette Smoking Man
Here is a list of stuff for the feat.txt. By the way I don't know why it should be a feat to build an army of ten units maybe 50 units would be a better reason for a feat. But I didn't find something related to your unit problems.