He's talking about the recipe for the ascended insignia, not the masque. Fastest way to craft would be to stat swap armour/weapons in the forge to vipers. Also crafting expact prefixes is WAY more expansive than they need to be, so stat swapping from a core prefix to a expac prefix is often cheaper as well.
A comprehensive Dualsense Controller Configuration for Guild Wars 2 (including all combat bindings, touch menus for mounts, UI, mastery/novelty skills, and squad markers) r/Guildwars2 • PSA: Don't trade Plastic Fangs, Chattering Skull, or Nougat Center with the NPC to get the rare versions!!!!!!!
Double-click to choose a recipe for crafting gear with the Viper's stat combination. Saphir's armor. Saphir's armor is an ascended armor set. All armor pieces in this set are created from a Saphir's Assassin Insignia and therefore have Assassin stats. Envoy Armor I: Experimental Armor is a Legendary Armor collection achievement to gain the first tier of the precursor armor for the Legendary armor, Experimental Envoy armor. This collection is the first step to obtain the armor. The envoys shepherd the souls of the dead to their place in the Underworld.

Sadly there isn’t a way to change ascended back pieces except for the LW3 items and only specific ones. As pointed out above they are more of a accessory and aren’t able to be changed via the mystic toilet. Admittedly I would really like that to be an option but sadly it isn’t available at the moment.

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how to get ascended armor gw2