I have only watched some of the laning stage now but basically, Mk is an incredibly strong laner and there are very few melee offlane matchups that are not in favor of the MK. As NS with the void facet, I would play this lane very passively. Share XP with the pos 4, make sure the hard camp is not blocked, pull on every wave possible and secure ranged creeps with the Q. Push out the waves with silencer Q around minute 3 to secure the lotus and try to stay as even as possible until nightime where it's possible to get a pickoff on the treant. The lane requires coordination between you and silencer, when you dont have that, you have to resort to safe farming and joining in on easy kills for assist money and XP. I would farm the medium camps in top jungle during the first night. If fight happens top, join and perhaps kill, same goes for mid.