....So, you haven't run the 34, or 35 PoE, which has etheric light as a guaranteed drop. You don't even need a treasure key to get it. Since you've run the 32 three times, I imagine you've obtained the armor core, which allows you to purchase the gauntlets and get to 33. You aren't going to get etheric light by doing arbitrary grinding. You get it by doing the activities which actually guarantee the drop.