On the topic of plagiarism, I once had someone steal bits of a character sheet (word for word!) in order to ship with me. Fun times. Stealing of any kind is a writer's worst nightmare so always be ready to cite sources! If it is not your idea or original work, don't try and pass it off to be! Stealing someone's ideas is cruel and unfair to the original creator, and if you think other wise you may need to set your priorities straight.  It's only right to at least @Mention someone if you use their work, and remember: there's a reason colleges can kick you out for using the words/art/code/research of another person without referencing back to the original work.