Prison of Elders level 28. You will get between 2 and 6 from the 2 small chests in the treasure room. Leveling up factions give you 4 each time, but unless you have one close to turning over- that can take a while. Pick up all the Vanguard bounties you can- and head to prison.
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Do nightfall, completed it once and i got 17 from the rewards. Its luck tho, u might it it or items.
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Any activity. Remember u can get SCs from any engram not just weapons or armor.