Arjien
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For those experiencing glitches, please post here. The quest mentions the number of troops in the garrison (like 50 High Druids, 30 War Unicorns, and 10 Green Dragons - he counted my Emerald Dragons at a good rate). We leave Fedya in the castle with archers and druids. The rest, along with the new hero, go to meet their fate. Head west and into the castle (as a result, the hero levels up better than Fedya). Slowly eliminate the Necropolis outposts, and then switch places with Fedya. The main thing is to leave as many archers as possible in the castle. You don't need to take the Necropolis castle. By that time, there's nowhere left to improve the hero => it doesn't make sense. Then, gather the necessary garrison and say goodbye.