Aftershock is IMO One of the Worst Runes, Here is What I Would Change
To start off I think it is so bad because it offers far too much for squishies and far too little for tanks the champions it was designed for.
Most people suggest to make the armor and magic resist buff scale with a percentage of the champions resistance stats, but that only solves 1 of it's big problems. The other problem is the amount of effective time it has. It is only active for 2.5 seconds. This duration is much too short for tanks who want to have extended fights. I think that if Riot added a duration scaling so tanks could have it active for a longer duration then the rune would actually fulfill its purpose. Maybe for ever 100 armor or every 100 magic resist the duration is extended by 1 second. Something along those lines.
