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I played through the map, but quickly. Now I'm playing through it again.
I killed the Water Decan with one dragon in one turn because its breath attack deals damage.
I couldn't figure out the Air Decan; it wasn't clear that you first need to attack upwards after the electro-cloud, and then attack it.
There's a bug: the quest to return the troglodyte says you'll be paid for it, but in reality, there's nothing there.
I highly recommend removing Pathfinder from the hero's skills, and from the event with the dragonfly, because it has zero value on a single-player map... and it takes up a whole skill slot!
Now I'm playing through it from the beginning, quickly... everything seems fine, except I need to find 1 sulfur (plus the one from the dragon zoo)... or I'll have to increase my spell power to 9 and sell junk for 2 sulfur in the mercenaries' guild.
I'm killing almost everyone; my army consists of 1 mage, 1 ice elemental (he joined me), 2 gargoyles (7 unrecruited), 2 hobgoblins. Soon I'll earn enough to recruit 15 more hobgoblins (by the way, I only found 18 hobgoblins out of 19 for the quest... where's the last one??? 15 are in the hut, 2 are in front of the hut, 1 is with the necromancers).