 If you liked
Devil Survivor 2 The Animation
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 ...then you might like
Yuuki Yuuna wa Yuusha de Aru
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In both anime, people fight against gigantic abstract enemies that share the common characteristic of having unique abilities and a final "core" to destroy.
In Yuuki Yuuna, they're Vertexes, and in Devil Survivor, they're Septentriones.
There are ~9 Septentriones and 12 Vertexes total trying to bring destruction upon the world that must all be defeated.