Dragon Gauge
Official Lodestone Job Guide (Always up-to-date)
Dragon Gauge is Dragoon's Job Gauge.
Dragon Gauge
Upon learning the action 
Geirskogul at Lv. 60, you will be able to view the Dragon Gauge. This timer indicates the duration of Life of the Dragon, which increases damage dealt by 10%. Using Geirskogul grants Blood of the Dragon.
Upon learning the trait 
Life of the Dragon at Lv. 70, this timer will now indicate the duration of Life of the Dragon, which increases damage dealt by 15%. Using Geirskogul will instead grant Life of the Dragon, and allows for the execution of more powerful actions such as Nastrond and Stardiver (acquired at level 80).
Available after learning 
Lance Mastery III at Lv. 90, using Raiden Thrust or Draconian Fury will sharpen the Firstmind's Focus, up to a maximum of 2 units. Once their focus is fully sharpened, you can execute Wyrmwind Thrust.
Simple Mode
First Brood's Gaze
Firstminds' Focus