If you're asking about rerolling an old IB weapon AFTER you've already spent etheric light on it, my guess is that it will reset the weapon back to it's original 300/331 max and make you spend another light after you've redone the exp on the weapon. I don't know for sure, but it's supposed to reset all progress back to the weapon base when you reroll.
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Edited by TheNcredibleMrE: 7/3/2015 11:10:00 AMThis was posted before HoW on April 22nd.