Apparently anything you get from a chest you won't get in hard mode if you've already done it on normal
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So we won't get anything from Oryx either if we did it on Normal?
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The glyph and the daughters' chests do have hardmode rolls (even if you've done normal already), but they are not guaranteed drops. So, there will be times when you get two items, one item, or no items. As far as I'm aware, Oryx is a guaranteed drop on hardmode.