Read the hotfixes and patches, bungie already said the ONLY way to get etheric light is from PoE and Nightfall
English
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Also Iron Banner
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You forgot Trials you get it from ToO
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Yes I went 9/0 flawless and got an etheric light in the silver and gild package and in the lighthouse in the chest.
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You can also get it from Iron Banner, according to Bungie. I've also gotten them from both the silver and gold tier reward packs for ToO.
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and apparently trials????