liandrin
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it went quite quickly; an elf doesn't go to a castle with demons, so the army constantly grows there. You move quickly, take all the mines, build your castle, and the first elven castle. The main thing is not to let him capture the mines, as he also has little money. Try to kill all his heroes who start moving. I easily defeated Gilraen; I was even surprised myself – one move, and the mission was over. I built the "summon creatures from the castle" magic, which helped a lot; I didn't have to go home every time. I captured the second castle (top right) and went with two heroes. By the way, the army wasn't very large (3 growth levels). You need to move quickly and conquer everything, attack him while he is weak.