Мститель
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For the Sylvan faction - Ossir. Wingael is uninteresting - on a large map, in a battle with an equal opponent, he will crush anyone.
For the Demon faction - Nimue. Together with the Wide Gates of Hell, the Master of the Gates (if leadership suddenly appears), and the Amulet of Mastery (if I find it), she becomes a real beast.
For the Haven faction - Axel, because paladins are significantly strengthened, and I really like training monks into paladins! Therefore, there will be more paladins, and Axel's specialization will be all the more effective, the more cavalry we manage to prepare.
For the Academy faction - Razazak, because he has a rare and usually very useful defense skill.
For the Dungeon faction - Iranna, because it's not so easy to kill her Fury units, and they deal more damage to the enemy before dying than they cost.
For the Necropolis faction - Lucretia.
For the Fortress faction - Erling.
For the Stronghold faction - Garuna.