The ancient ceremonial mask is part of Ancient ceremonial robes. It is dropped by ancient mages and Nex's minions in the Ancient Prison, and doesn't have any requirements to wear. When this item was first released, players were offering as much as 30 million coins for the mask on the official forums. Upon wearing the full set, players do not have to obtain a kill count to enter Nex's chamber.
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- hotfix 27 January 2020):
- Ancient Ceremonial will once again bypass the killcount requirement when trying to enter the Nex boss area. 
- ^ Jagex. RuneScape's Twitter account. 27 January 2020. (Archived from the original on 27 January 2020.) RuneScape: "#RSHotfix - Ancient Ceremonial will once again bypass the killcount requirement when trying to enter the Nex boss area."