Took him down with my level 60 boxed team (3 mercs). 75% slowed on first try. He seems to have similar HP as the rest of the mobs around him so the fight lasted less than a minute. Dropped Rhenium Ore.
Soloed today, 65 enc with TD3, charmed pet got down to 40% HP at end of fight. Was able to slow and mez Nevor, but it was immune to root/snare (as was mentioned earlier). Nothing dropped.
Killed this guy and his partner (Kaith Harrowsky) in other side of temple/shrine twice each today. Neither of them dropped anything. No parchments, no armor, or anything.