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I read all the responses and was a bit surprised. I haven't played this mission for a long time (and not just once, I just like to replay all the Heroes campaigns from time to time), and I don't remember any bug with the Behemoth. It came to me exactly on the 3rd day of the 3rd week of the 2nd month, just like with SuperGuru, although my army was weaker, so I defeated it in the castle.
Regarding the hero's development, I agree with Dancing. Light and Luck are essential for a Ranger, Logistics is also highly desirable, otherwise you will have trouble in the last mission, as the Lich King will catch up with you because he moves quite far in one turn. As for the fifth skill, I personally recommend taking Education. In addition to the bonuses it provides, it also adds primary skills to the stats, starting from around level 10. At first, the effect is small, but it will improve your hero's stats and help you gain experience faster:)
PS I'll start playing this mission tonight:)
Regarding the hero's development, I agree with Dancing. Light and Luck are essential for a Ranger, Logistics is also highly desirable, otherwise you will have trouble in the last mission, as the Lich King will catch up with you because he moves quite far in one turn. As for the fifth skill, I personally recommend taking Education. In addition to the bonuses it provides, it also adds primary skills to the stats, starting from around level 10. At first, the effect is small, but it will improve your hero's stats and help you gain experience faster:)
PS I'll start playing this mission tonight:)