Responses
The novel you read was most likely the fan translated one. It's not wrong, but from what I know the official English translation of the web toon calls them darkness. And I do believe the translator of the web toon have announced they are just keeping to the official naming. But I do understand that it feels weird after coming from reading the novel

Is it just me or the translation often have a very different meaning from novel.. for instance when they are talking about blood to fight back the dead mana, it was translated that they (choi han, rosalyn, and lock) doesn't believe the kittens while in the novel they actually does't believe Cale.
Well, its not that serious, just throw me off guard a little