So I decided to play nocturne and use him as an assassin to burst down vayne

Last Season I was able to assassinate Vayne very easily even with devourer build which isnt that bursty. Here is hwow the assassination works: You get an upgraded sweeper, your build is like this :

you spot and isolate the vayne, you activate youmous, hit titainc active, activate sweeper and Ult in . Then you combo mid air q, e, auto, bork active, smite and you kill her.

That combo used to one shot any carry and it still does. well except Vayne. I can't kill that bitch if she has ultimate up simply because i cannot SEE her. The removal of the true sight buff from the sweeper is the reason for this. I just ult her and prepare to do my combo but she vanishes and i just dash to the thin air and stand still look like a fool. She then reappears like 5 miles behidn you and coondemns you into a wall and u die. Pinks o work until you get liek 4 items, then u have to start building parts for other items and you cant buy pinks. So only solution is the current sweeper. BUT i can only see where she is , i cant target her!. maybe i hit my q or E but she gets qss and removes everything and i just can't touch her.

I just feel completely powerless. I can't do my job as an assassin because of one item. The vision changes this season were rubbish. Why was stealth detection an issue ?? i bet you that's why rengar spiked at the beginning of season 6 because of the sweeper changes.