[Endoperez]

All of this is under 'IIRC' -warning. I really hope I remember this right...

DomII AI does not calculate by the numbers - it tests the spells. The AI runs maybe five tests with both Fire Flies and Fire Darts. The one which has most effect on the tests (most damage caused) will be cast. Lucky cast of Fire flies can be better than that of Fire Darts, and so can be five.