Your Win Condition
Poke him to 65% health and then look to all-in and combo
General Strategy
Try to poke him with Q1s and sometimes Q2 in lane Do not get frozen on Avoid Q2 Eing forward when you are both healthy
Trading Patterns
Take short trades against Darius and try to space him out. Try to poke with Q1 or Q1 E in lane so you can deal damage to him while staying outside of his pull range. You must land your Q3 sweet spot on him. You might have to play the flash mindgame in higher elo in order to secure it.
Wave Management
You want the wave on your side so you can freely poke him without him being able to all-in and look for an extended trade with ghost.
Their Win Condition
Freeze on you and look for a 100-0 all-in
