How do i get Antiquated Armor

[Urthdigger]

There's three kinds of "artifact" armor. There's the ilvl 50-55 set you acquire over your level 45 and 50 job quests, there's the item level 90 set that WAS acquired with tomestones, but is now acquired via the antiquated armor that drops in certain dungeons (I know Sastasha Hard is one of them, there's another that's the same difficulty that drops it as well), and finally there's the item level 200 set that was acquired using tomestones, but is now acquired via Centurio seals.

[Niwashi]

there's the item level 90 set that WAS acquired with tomestones, but is now acquired via the antiquated armor that drops in certain dungeons (I know Sastasha Hard is one of them, there's another that's the same difficulty that drops it as well)

For people doing their level 45 and 50 job quests now, they get the iLevel 90 set as additional quest rewards (along with the iLevel 50-55 set that those quests have always given).

For those who'd already done those quests before that change was made, the iLevel 90 pieces are available by trading Antique Mail (or Antique Helm, Gauntlets, Tassets, Breeches, Sollerets, as appropriate) for the gear. The Antique items are available in Sastasha (Hard Mode), Sunken Temple of Qarn (Hard Mode), or Snowcloak. The trade-in NPC is Kakalan in Mor Dhona.