Ancestral robes can be obtained as rare drops from the Chambers of Xeric. Equipping the robes requires level 75 Magic and 65 Defence.
They are the best-in-slot robes for magic attack, trading off some of the defensive bonuses that Ahrim's robes offer for benefits such as better magical accuracy and the highest magic damage bonus. However, when casting Ancient Magicks, virtus robes surpass them in magic damage, while they also provide the same accuracy bonuses and slightly better defence and offers a prayer bonus compared to ancestral. Ancestral robes do not degrade in combat.
The robes can be recoloured using a Twisted ancestral colour kit, which may be obtained from completing a Chambers of Xeric raid in Challenge Mode. It is no different from normal Ancestral robes aside from appearance and becoming untradeable.
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^Mod West. "Ancestral Robes". Reddit. 18 November 2016. Archived from the original on 6 November 2022. Mod West: "Yeah, I worked from the same concept of those robes." In response to the comment "These robes are literally the same as the Novice Robes from Skyrim."