That's not a bug. There are small bluish-black "clouds" in various locations. If you move over one, it kills a certain number of troops. There is a hut that gives you a quest to collect these "clouds" - you'll be given something that eats them and asked to fill it up and return it. So long as you have it, you can move over the "clouds" safely.
edit: Found the correct names. The clouds are Evlins and the thing given to you to collect them is Egnum. I believe there are a total of 15 evlins available to feed Egnum, minus the ones you've already encounted.
Last edited by Sir Whiskers; 02-17-2013 at 01:24 PM.
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