How do you upgrade vanguard level? Are there done levels I need to know about or how to get to vanguard level 1?
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Bounties, weeklies, dailies... grind grind grind.
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Rank with factions is gained by earning reputation from doing activities. Vanguard rep is earned doing PvE bounties/ activities. Crucible rep is earned doing PvP bounties/ activities. Dead Orbit, FWC, and New Monarchy rep is earned by wearing a faction class item and doing PvE and PvP activities. You can check how much rep you have for that faction at their respective vendors.