Eureka

Finish the Stormblood main scenario questline.

Speak to Rodney in Kugane (Pier #1) to enter Anemos. Eureka

Have your Job's Level 70 Antiquated weapon (if discarded, buy it from a Calamity Salvager). Finish the Stormblood main scenario questline

Slot materia into your gear, as it is essential for elemental bonuses. Eureka

Which are you starting in? (Anemos, Pagos, Pyros, or Hydatos)

Buy Kirin’s Osode (physical) or Vermilion Cloak (magical) from the Market Board or exchange items at Kugane Pier #1.