Wait, you ganked him and he landed a Q on _both _ of you?
Still, regardless of how stupid that is, a 2-person Q heal would be 12% x 2 = 24% which is a quarter of his missing HP. You should be able to overcome that, it's far from "he healed to full".
Also how the heck did he kill two people at level 4, he doesn't have the Guillotine yet... oh, of course. You let him stack his passive 5 times, didn't you. And suddenly he had 190 AD at lvl4. lol
Here's the thing: if you're bad, you must simply improve. Most champions at top have some sort of a gap closer or poke. Or you could just ignite him if you were using it. I can understand that you can't play around him, so here's a guide -- I hope you will not ignore my advice, this took 10 minutes:
You must realize that you cannot just fight people, ignore their mechanics and expect to win, especially now that Rito finally is brave enough to give serious rewards for succeeding with your champion (200 AD on Darius, massive heal on Fiora, 3-hit oneshot with Morde, time-nuke if you ignore Ekko's hologram etc).
Darius has a few weaknesses:
- first off, he cannot deal with poke. He can't heal if he can't hit you with his Q, so you need a champion that does two things. Deal damage safely, and stay clear of Morde's pull combo. That could be **Lissandra **(you can seriously mess him up with your poke, then root him when he pulls you so you can stay in the INNER RING -- his slow will not allow you to get out), **Teemo **(instread of panicking and running, blinding Darius when he pulls you means he cannot slow you with his W so you can stay in the inner ring and take minimal damage, then run away) or Gnar (constant poke from huge range, extreme mobility in mini form and if you get pulled, just jump away on a minion or Darius himself).
- HIS Q HAS AN INNER RING. USE IT. It's not there for decoration -- when he pulls you, you can't walk out of it cause you're slowed. STAY INSIDE IT. You will take half the damage (which is nothing compared to the outer ring nuke), he will not heal, and you will not get a bleed stack. His slows are short, so by the time Q strikes the slow'll be over and you will just walk away with one-two stacks on you, and his E will be on a 20 second cooldown. Engage immediately.
- QSS can mess Darius up (like everyone else). Using it right before he ults will cleanse any stacks you may have, halving its damage and unless he undershot it too much, you will not die and put it on cooldown. Also his Bloodrage will end quickly because he won't have 5 stacks on you anymore. Or just pick GP.
- If your issue is his heal, apart from dodging his Q properly, you may ignite him before you hard engage. Especially in team fights igniting Darius is a good idea, since your retarded team will probably let him hit 3-4 people with his Q, healing for 1/3rd of his missing HP.
- Another thing that screws Darius up is knockbacks. When he gets his hands on you it's hard to escape him without a good gap opener, but a Tristana ult is enough to negate his damage for ~5 seconds (or for the entire fight if you force him over a wall). Unless he flashes or there's a Thresh, he cannot rejoin the fight fast enough, unless he has a TriForce and a DMP I guess. It's still effective tho.
- Like all Juggernauts, Darius becomes stronger as his HP gets lower and lower. When close to full HP, his heal means nothing, but when he's at low HP, his heal is essentially %max HP. Poking him early is okay and works fine, but in late game team fights YOU CANNOT AFFORD TO STAY NEAR HIM, ESPECIALLY IF HE'S LOW HP. Darius being low HP means he probably put a few stacks onto someone -- staying near him without immediately killing him brings him closer to a Bloodrage every second, and it makes him heal for a shitload of HP. Killing Darius in fights should be like defusing a bomb:
- First: kite him and poke him to a comfortable level. Never go near him. Slows and %HP damage tools are amazing -- a well protected Kog'Maw is every Darius' worst nightmate. He can't reach Kog , but he must stay inside his massive range to be of use to his team, taking huge damage in the meantime.
- Second: WHEN YOUR TEAM IS READY TO ALL IN HIM WITHOUT GETTING OBLITERATED BY HIS TEAM, you must all converge on him, CC lock him and put him down in seconds. Make sure you stun him as he gets lower and lower -- letting him land a 3-person Q at low HP can cost you the fight. Ideally, you will kill him as fast as possible, with as few people close to him as possible.
Practice these and you'll see that Darius is not that huge of an issue if your team is coordinated.