He is found in n-7, you need a pretty hefty party to bring him down, 3-4 sticks with at least 600 hits and a good healer.  He can prone for up to 500 or more, he charges and wears a pair of untied sd scales.  His sword is a pretty nice token to have though, +3 and hits real hard,  get it enchanted and you wont be putting that weapon away for a long time.