Aftershock can possibly bring back tanks
What if aftershock was able to capitalize on your 'bonus' armor and magic resist, giving you more based on how much you have added with runes and items. Maybe even could have a longer duration with testing.
Or something like ' After immobilizing an enemy champion gain X armor and mr and reduce the damage taken from that champion by Y% for the next 4 seconds.' this would prevent tanks from being one shot and also let them but time for the team to show up.
That would make tanks be a little more viable later in the game and champs like Pyke and lissandra wouldn't be able to abuse the defensive stats. It basically becomes like how electrocute and aery scale with ap and ad, except it scales with armor and mr, instead of levels.
aftershock Riven for Aftershock nerf ).