Ummmm......need some clarification
When a champ is specifically made to counter a damage type and then the enemy team picks champs of that damage type, why does that counter champ still die immediately? Scenario: I picked malphite to counter an irelia, vayne, and kindred. I stacked armor and health. I had 500 armor, 90% damage reduction of the physical type. And.......I died 3 seconds later to auto attacks. Something isnt right there. Explain.
(attack speed slow aura) or
(hurt them for hurting you, and oh yeah, don't try running away punk) and then stacking health.

or
over the Randuins or deadmans to increase damage out put or with a
over the randuins. The crit element reduction from Randuins wont factor into that matchup too much so stacking the unique passive from it and FH makes it expendable. If you were still melting to them it means your positioning was bad or you weren't using your champ properly in teamfights. A ninja tabi could also have helped since all 3 of those champs are aa reliant.