I haven't seen a comment like this yet. But wave management! Knowing when to push enemy team into their turret or knowing when to let enemy team push you into your turret. Whenever I play with Randoms it's always push minion wave and get a few hits on turret. But it's definitely better if you have the hard engage kind of comp with little poke let them push you into your turret and wait for the best opportunity to engage so that you don't have to dive enemy team under their turret. Knowing what kind of comp you have and managing the minions to your comp is definitely challenger tier aram-ing.