If someone afflicted by the Curse suffers from severe emotional and mental pressure, they lose control over their inner beast and unleash it as a manifestation of the thing they most regret.

Curse dwellers represent the regret of overattachment one has to another. They track their loved ones and once reaching them, they drag them into their own corrosive dimension, keeping the prey for themselves forever.

Thanks to  sturmschwinge for helping out! :>