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Crafting keys will cost credit plus a regular Void Key form any mission. You can buy blueprints for all four keys using credits and craft them in the Foundry.
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There are four different Dragon Keys in Warframe, each comes with a modifier that can affect your stats. Playing with a Squad of 4, each carrying a different key increases the chances of unlocking the room and getting a corrupted mod. The key can have modifier that can affect your game so build a Warframe that can manage the effects. You can buy or build a key and then add it in the consumable slot.
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Dragon keys are required to unlock Orikin Derelict. If you can unlock the door you will get a Corrupted Mod.
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