Nocturne build

Ok, so I started a month ago and have gotten the IP to buy my first "real" champion, Nocturne. So, I've already gotten him to level 4 and have had great effectiveness using him. I plan to get him to the highest level possible. In order to do that, I need help from you to evaluate my build that I've been using.

This is the item build I have been using. I have had great success almost oneshotting the enemy carry with my dive combo, but I'm wondering if it's the enemy that is not building properly or if my build won't hold up when I level up. But Idk, I get lots of attack damage, magic resistance, armor, lots of movement speed, lots of attack speed, sated for umbra blades, cleave, lifesteal, health, cooldown reduction, tenacity and revive. I think it's pretty good, but do you think that it could use a or a ? I heard Bork was really good for Nocturne, so should I switch it out for the Hydra?

Help me out please!

Edit: do you think I should switch out Zephyr for Youmouu?