When the August 8th update is released, WvW and PvP players who own Heart of Thorns will be able to upgrade their WvW and PvP ascended armor to have legendary attributes! This new type of armor will not have a unique skin, such as the one that is part of the raids legendary armor, but instead will consist of an upgrade to WvW and PvP ascended armor that gives those armor pieces legendary stat-swapping capabilities without changing the skin.
The following PvP and WvW ascended armor can be upgraded to allow stat swapping:
• Triumphant Hero’s Ascended Armor
• Mistforged Triumphant Hero’s Ascended Armor
• Ardent Glorious Ascended Armor
• Glorious Hero Ascended Armor
To upgrade a piece of WvW or PvP ascended armor, combine 3 new PvP or WvW gifts with 1 piece of ascended gear in the Mystic Forge. You can purchase ingredients for the gifts from either Commander War Razor in WvW or the Ascended Armor League Vendor in PvP.

Read More:
https://forum-en.guildwars2.com/forum/game/wuv/WvW-and-PvP-Ascended-Armor-Upgrades