Hey Help me out

I don't know if its a dream or a memory, I remember reading or watching this but I cant exactly tell if it was an anime or a manhwa I read.

So it goes like this 'a cursed guy is venturing out to kill someone, they have tree growing out of their back and they reach a territory that is neutral. He creates a giant cocoon around himself, and the main characters due to some accident are sucked in to that cocoon. The other spiritualist or exorcist who gathered, couldn't enter the cocoon' And stuff happens later. I know its pretty vague but it's the only thing I recall. Idk if its something I came up on my own