I think they come from the strike medal bounties.
The new dawning sets come from the dawning treasures
English
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Finished two of those bounties already on got this weird recolor of a Green(?) titan set, looks like ass, called the "Snowglare" set but it's not the Vanir remake so I'd assume the same applies for other classes.
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They redid the seraph armor in the dawning treasures as chroma too