Idk if I'd consider DZK horrorcore, but he does have some songs that might suit what you're looking for. He reminds me of early Em with worse production, but he has a smooth, easy to understand flow.
Here's a couple examples:
I don't know much about the sub-genre. Is the defining factor about the lyrical content or are you looking for certain sounds? Of the few artists I know on Lucem's list(above) doesn't make me think horrorcore like Necro does.