Ahahaha..haha...ha actually my friend, that 'man' isn't actually a 'dad' to those orcs and those orcs aren't actually his children. And that woman you saw is no other than a nun. Sooo you're getting to my point right?
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In my perspective I think that man was once a religious fellow finally lost his mind and has been creating his very own 'children' to fulfill his inhumane desires. And maybe even brainwashed some sisters along the way or convincing them to make 'a new world' just for them.
Sorry for making you read this useless theory of mine but I just can't help sharing this since I've read this story more than two times and crazy ideas going inside of my head because of this stupid curiosity of mine.... (⊙…⊙ )
No it's okay.. it's an interesting story after all. He himself had that design on his belly like he carved one the stomach of that guy who died(forgot if they even mentioned his name).. so I think he has a womb too? Since that's what the carving procedure lead to? So maybe he is after all their father?
This was disgusting but I don't understand a lot of things.. like why is their dad a human and who's that woman? And why are the children orcs and why is there so much incest