I can say that upgrading your thralls is not very difficult. If you go to a few smaller Accursed camps, two players with tier one thralls could capture an Accursed Fighter III, with a small to medium chance of casualties. But capturing one tier three Accursed is a good stepping stone towards capturing more, and graduating to capturing Berserkers. Leyshine of The Goblinoid located in G8 is a guaranteed spawn location for Berserkers, with a few low tier fighters and random crafters around as well.
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