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I can write a walkthrough for the "Dragon Slayer" campaign if needed. As for the last mission on Mutare, here's a tip: as a bonus, take 6 dragons, and with Mutare's level around 30+, after visiting some skill-boosting locations (there aren't many in this campaign) with Wisdom and Earth skills, you can complete the mission with a rush. That is, immediately run to the nearest entrance to the dungeon and you'll end up on Orwald's and another one's territory. With 6 dragons, you can easily clear their starting armies and cities. (To prevent Orwald from having a huge army in this mission, you need to kill him in the previous mission).