Not bad, just some quick reminders.
Remember to use your W as an AA reset.
Auto attack first, and then use your W immediately after for full effect. For example, in the first fight with fizz you used your W without having it be a reset.
I would highly recommend you not build any of the hydras on darius. Although effective, tankier items are typically better for darius. A good substitute item would be steraks gage which synergizes well with Darius's high base stats (both HP and base attack damage). I personally have black cleaver and deaths dance as my two damage items followed by pure tank afterwards (Of course, DD darius is a little off meta as well).
Other than that, looks nice. GL and keep up the good climb with the D man.