From Final Fantasy XIV A Realm Reborn Wiki
Shadow Fang is an action unlocked by questing at level 30. It's available for Rogue.“
Delivers an attack with a potency of 200.
- Additional Effect: Damage over time
- Potency: 90
- Duration: 30s
- Additional Effect: Increases Ninki Gauge by 10
- This action does not share a recast timer with any other actions.
— In-game description