He was level 115 and there is only one in the dungeon.

He does not attack until you attack him
He says the following when you attack/ Kill him

Strange Sclavus yells, "Death to the intruders!"

Strange Sclavus falls. It hisses with its final breath, "Tell my wife I love her very much.

it occurs to me now after reading the book of memories that this was Gareth Dain. (oops)