Minecraft Dungeons:Gilded items

Gilded items are a type of item only obtainable in Ancient Hunts, the piglin merchant, and the Tower's gildsmith.

Obtaining
Gilded weapons and armor (not artifacts) can only be obtained via Ancient Hunts, (requires the Flames of the Nether DLC) trading with the piglin merchant, (requires the Flames of the Nether DLC) or converting an item to the gildsmith.

All weapons and armor currently in-game have gilded variants that can be bought or dropped from a certain ancient mob. Prior to the release of 1.12.0.0, a DLC-exclusive ancient mob like The Swarm drops items exclusive to the DLC it comes from.

Another way of obtaining a gilded item is from the Piglin merchant who will trade a gilded item for gold that fits your level. There is also the gildsmith who can turn a selected item into a gilded version of it of which the player can keep if they decide to leave the Tower.

Use
Gilded weapons/armor gives special bonus enchantment to your item. If you play on a lower difficulty you might get a tier I built in enchantment but on a higher level you can get it up to tier III built enchantment, keep in mind that these enchantment are random for your gilded weapon/armor so their is now way to choose your built in enchantment.