Trying to figure out a term for a half human, half demon. I know that Nephilium is a term used for half human, half angel, something like that would be good. It's a blood thing, but just saying half demon sounds so bland.
Make something up that sounds good. All you have to do is explain once what he is. Then you can use the name over and over without worry of the reader not understanding what it means. This is fiction, you can do as you please. Type in some English words like "half" or "evil" in this Latin dictionary and then smoosh two or three words together until one sounds cool to you. http://www.archives.nd.edu/cgi-bin/lookdown.pl
Hi, If you play Neverwinter you'd discover that they call a human with some demon blood a tiefling. Cheers.