Hello there, Darius is known for being one of the strongest level 1 champions in the game and little to no champion can 1v1 him lvl 1 (depends if it's ranged or not) and in low elo they never respect that and always u get a free lvl 1 cheese or kill or burn sums, first thing you wanna do is let the wave come to you meaning WHEN the first 3 melee minions are very close to dying instantly Q them

Next you wanna let 2 minions (depending on how much xp you have) then you wanna Q the minions u need to get lvl 2 and hit with the outer q ur enemy then you wanna take E open ghost and run him down the lane use flash ONLY to do ur final q and when the passive is gonna finish him off, then the rest is to freeze to ur side IF your dealing with a ranged champion you wanna take Dorans shield and pray for a gank if you ever gonna get one and don't try to outplay or doing any stuff like that cause trust me u cannot win a vayne top, the only way you kill her is when she takes a further step closer to ur stacked wave and u E her you will get a flash or if she ego's it you can easily kill and rundown with ghost since her lvl 3-4 isn't that good until she gets berserkers greeves which will allow her to kite u easily.

And now you will ask me why the heck is darius so op in low elo and the answer is that a low elo player doesn't have that much expirience vs a darius since it's rarely picked from what i've seen and they don't respect the level 1 and think they can easily bully him also he has a very huge outplay pontential in lvl 6 even if u lose level 3-4 with your ultimate and ghost you can abuse these advantages to dodge skill shots or try to get a close as possible to stack ur passive and execute which isn't that hard and for the final part. You can abuse the low elo wave management to make the wave go to ur side because the most common thing they do in low elo is to permantly push the wave to ur tower.

My personally favorite build is

Plated steelcaps to stridebreaker, death dance or steraks, then maw or FONE (force of nature) IF they have too much burn dmg you wanna go with Fone if they have squishy mages go Maw for the dmg and also provides good MR, then if you want to go something else for final items it's up to you

You can really go whatever you want i have put the items i mostly use, they are very situational but it's a customizable build cause u can throw in qss tank items and whatever u really need.

I've putten the runes in their section but you can really go second wind OR go with the sorcery sectin and then go with nimbus which allows you to go super fast and approach your enemy really fast and celerity which gives you a minor ms buff