[Gregstrom]

It's like this:

If any army is in dominion that isn't theirs, it gets -1 morale.

If an enemy army is in your dominion when you have Dark Skies up, the army gets -1 morale for every candle of your dominion in that province.

Both penalties can be applied at the same time, so for the example in the other thread (an enemy in 10 candles of your dominion, with Dark Skies) the army gets -10 for Dark Skies and -1 for being in a dominion that isn't theirs, for a total of -11.