Necrim are not something most people have ever seen and certainly they don’t understand what they are. What they are is actual a cybernetic organism from the era of the Cataclysm. Their flesh is wrapped around mechanical components which makes them very hard to kill.
Necrim are found exclusively in Ruins.
Necrim are not known to eat… anything. It’s a mystery how they survive. People only know they do.
Necrim are usually found alone, though sometimes they seem to operate in small groups.