Instead of him giving you a gun, he gives you the ability to reroll 1 weapon, 1 time with 3 different rolls just like the weekly bounties he currently offers.
If you like one of the rolls you choose it.
If you don't like any of the rolls you cancel out.
But you cant reuse the reroll. 1 time use.
You cant exploit it cause you can only do 5 bounties a week... period.
That is all
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What about legendary marks?