Does anyone know how much longer the dares of eternity will be active, or are they going to be a permanent feature?
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This activity is not going away anytime soon. The deadline to earn the Vidmaster Seal in-game for the purpose of buying its physical medallion from the Bungie Store is December 7, 2022, so it's going to be available at least that long. If and when this content is vaulted, Bungie will most likely announce that in the TWAB.