What is the counterplay to zed late game?

I've noticed that Zed late game is not thát strong compared to other champs, but there is one thing I don't understand about him late: - His ult (Death Mark) prock deals, in my opinion, unbalanced damage. I played Jhin, 1900 hp with 145 armor, everybody practicly full build. Zed ran at me, W/flash ulted me and hit me with 1 W and 1 Q. I healed and lifestealed back up. The death mark prock dealt 1700 damage. Just from a 1 Q and 1 E. How do you play against it, since I don't see any counterplay to it..
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