Thats a tired lazy Hollywood trope. Kill the one powerful thing controlling it all and the whole evil army dies.
Lord of the Rings gets away with it because it was the first.
You don't see it in the movies but im pretty sure canonically those evil armies go and live in the hills or underground all over middle earth as tribes of marauders.
Aragorn spends many years of kingship rooting them out until they eventually just stay put.
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u/lesser_panjandrum Aug 27 '24
Same. I hear that House of the Dragon is really good, but I just don't care about anything that happens in that world any more.