The apparently still sighted one walks to the wall, almost like a golem in its unliving manner, takes a step next to the rogue, and hacks into into him. The rogue shakes off some of the necrotic damage, but not being dazed or weakened.
Most you feel its dark gaze on you.
They speak in a dark tongue, a form of ancient Primordian, twisted by Abyssal milenias. The other turns its sighlight gaze to the now weakened rogue and draws forth his life. Lucian drops, at 0 hp. (-5 for blindness, but its vs fort...).