Considering how resistant this guy was to damage and how much endurance he must have needed for all his equipment by the look of it, I highly doubt he was near my SL5 unless he has specific rings or whatever.
If this guy was near my level range than what gives trying to invade at such low levels. For all I know this guy has all his equipment at level 15 far as why I couldn't damage him just invading at this low level
I never had any invasion this brutal in Demon's. I at least have Demon's experience but people like this are responsible for complete beginners who trade in the game during their first week.