Iron Banner bro. I don't have any expansions but both my characters have fully ascended armor sets. It's not hard
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Not hard.... if you play with a fireteam. Which not everyone can regularly accomplish. I play on PS3 for example, and even with 5 pages filled with people I've added through LFG or Destiny, I would be lucky to have 4-7 online at the most. Not to mention that even they may have other friends to play with and thus not party up with me, again demonstrating how inconvenient obtaining Etherlight is.
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I did Iron Banner solo. It only took two Iron Banner weeks for me to get 4 etheric lights. If you equip the shader, boon, cloak/bond/mark, and the badge, you can knock out all the bounties and do it easily