Hi there, I just completed the iron banner seal and was planning on gilding it before reset, but noticed that there is no way to make progress on the "one and done" triumph since I have already completed all challenges on all characters this iron banner. shouldn't this retroactively count since I've technically already done the thing it's asking for this week? if I had waited until the second IB this season I would have probably missed out on gilding it altogether.
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Gilding triumphs are not able to be progressed until the base seal is unlocked. This is intentional. As such, you will need to wait until the second IB of the season to gild the title.