Dude do you realize these keys open chests at the bottom of Prison of Elders right? There will be multiple chests and you'll need them. End game though? Not really. Just because we have keys doesn't mean we will be getting threw the prison so easy and if you waste the keys on the lower leveled prisons you won't have so many keys. I highly doubt Etheric Light is going to drop as often as people think. Doesn't seem like people are going to be level 34 tomorrow at all unless they get a super lucky drop on the prisons and nightfall.