Please, please, PLEASE allow us to carry multiple offerings. Archon's forge is almost always deserted. If you wait long enough someone will usually show up (though I've waited 15 minutes without anyone joining); you both present your offerings, then after two rounds they leave because you're both empty and you have to grind for another offering before returning to the forge to sit and wait again. If we could carry multiple offerings, not only would we be able to do multiple rounds, but people would stay in the forge longer so we'd be more likely to join a group when we go in.
Making us wait for no reason is a terrible design decision. Please recognize this.
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There's also no real point in it once you get your artifact.