 If you liked
Claymore
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 ...then you might like
Immortal Regis
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Bouth of them are darker mangas whit monsters and have main character that turned from human to something inhuman just to be able to live on.
Bouth characters search restlessly for power, but they are forgeting that power is inside them and all other think that they are uselless since they have low ammo of energy , but they are blind to their growth and potencial of thair unique existance.