They are identical to Legendary items except that their base attributes (damage or armor) and all non-percentile affixes roll higher values for both minimum and maximum possible rolls.
In general, Ancient and Primal Ancient items are more powerful versions of Legendary items. For those of you who may have taken a break from gathering loot recently, we thought a quick refresher was in order to clear up any confusion about the differences between Legendary, Ancient, and Primal Ancient items. Ancient items truly shine in Season 17: so long as you have no Set bonuses equipped, each Ancient you equip will provide you with a massive 750% boost to damage dealt and 4% reduction in damage taken.
