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I completed everything =) Wier turned out to be a pushover; my skill was more than enough, I just didn't realize that I needed to take out two at once. And Gorl is a cheater, using Astral Gates and Phantoms. Thanks for the quick help.
P.S. The storyline is a bit weak, but it stays within the genre, although I would have liked a more unconventional plot development (it's predictable right away).