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For example, 40 ents, I defeat them with dragons, and 1 ent remains. Then they are resurrected, resulting in 3 ents, I attack again with dragons, and 1 remains, and so on with the others.
I went down there and through the portal that was there, I ended up with the elves; as I understand it, this is the only way to get to them. I didn't understand how to get to the demons. There's also a portal somewhere.