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Nightly Edelweiss, you probably completed this mission with a hero. But with a Warrior, you can actually defeat Gilraen with two heroes as soon as he leaves the castle for the first time. The second time, one of my heroes, a Druid, defeated him when he tried to storm the castle (Gilraen fled the battlefield). After that, Agrael easily captured the capital, and Daleb captured the nearest castle. The mission ended there.