This may be just me thinking too far ahead but I assume the Wolves roaming in Patrol are like the Blades of Crota and will not be around forever.
So what happens then? Will our only method of obtaining treasure keys be through the challenge levels in the PoE? As far as I can tell, keys don't drop very often from that.
What do you all think? When the big "Comet" expansion rolls it is likely that the threat of the Wolves will be over. Will our main access to keys leave with them?
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I am taking a wild guess here, but remember the Eris weekly bounty that gives 3 motes of light? I am guessing that each week, if we complete all of the Petra bounties, we'll get a key as a reward (like we did for completing the story this time around)