If have armor on (in this case Titan's Shroud) and I have the Luck of the Sea enchantment at level III, during an ancient hunt, when I get a reward after killing the Mooshroom ancient, the Gilded reward is removed when I get a unique reward. For example, I killed the Mooshroom ancient, and I received Fighter's Bindings, but it was only Unique and there was no Gilded rarity. I think what is happening is that when you beat the ancient, and the original drop is probably Rare and Gilded, but Luck of the Sea upgrades it to Unique and removes the Gilded.