League of Legends (LoL) Question: What to build lategame on adc

For me, it depends on the situation. Like if you're an ADC and your enemy team has plenty of CC, I think the best item for it is Mercurial Scimitar. If your enemy team has a lot of durability, use Lord Dominiks's Regard.

I usually build some pen, or, with press the attack, sustain(BORK etc). And when using Ashe or Kog'Maw, anything similar, even Black Cleaver works :). If you happen to run Fleet Footwork, i would buy crit, go full crit, and finish off with pen (lord dominik's or reminder)

If your opponent wants to stay alive from your attacks, of course he will buy armor. When someone already goes for two armor items then you should deliberate about whether it is even worth to attack him (and to spend money for countertank items).

I would recommend Lord Dominik's Regards if you want to get down fighters who really try to stack armor. If only the opponent Leona or Rammus go for armor items, I would not recommend the purchase. You should always know which enemy champion is your main target as ADC and therefor arrange your item build.

Also keep in mind that Blade of the Ruined King can be a smarter choice than Lord Dominik's Regards, especially when you are behind, as Ruined King applies additional damage based on the opponents life, while Mortal Reminder boosts your damage output.
If you deal no damage, of course there will be nearly no boost.

There is no set build you should go for every game, you must adjust for what items the enemy team builds. If they are low armour you can build some lethality, if high armour but low health than mix damage with armour pen, if high armour and high health then buy items like Lord Dominiks Regards. Ultimately you don't want to focus champions built defensively as they will have lower damage, only go in on them if they are open and get caught with CC, if they sacrifice magic resist for armour then leave them for your magic dealers and go after someone else. With jinx you ideally want to get a kill or assist on a vulnerable enemy player and then use your passive to help take down tougher players more quickly. You are more likely to lose the game on poor strategy than on a slightly wrong item build. I would only say not to build three attack speed items if the enemy team are all tanky, there is no point attacking quickly if you do no damage.

Something like this imo:



You can sell boots late game because you'll have move speed from your Zeal items. Of course you can switch out your armor pen item for Lord Dominik's Regards or your lifesteal item for Mercurial Scimitar. Guardian Angel is also an option depending on how like you are to die in the fight, but if you're swimming in gold, sell your GA and buy something else while it's on cooldown.

If you're full build on an ADC, see what your team needs/what would be the most efficient. If lets say, their Maokai was fed or being super obnoxiously tanky, the better choice would be to sell the mortal reminder for a lord dominiks. If your build is OK and you're full build, just build elixirs.