Blood of the Dragon is a Dragoon ability learned at level 54. When activated, the user is engulfed in a fiery blue aura surrounded by a spirit-like dragon. While active, it increases the potency of Jump and Spineshatter Dive by 30% while also unlocking the combo actions Fang and Claw and Wheeling Thrust learned at level 56 and 58 which extend its duration as well as the ability Geirskogul, which becomes available at level 60.
Stormblood introduces the Dragon Blood Job Gauge which also includes a sleeping eye. A trait called Life of the Dragon unlocks at Level 70. After using Mirage Dive a number of times, the eye fully awakens and upon using Geirskogul, the user's aura turns red and Geirskogul upgrades into the more powerful Nastrond. Life of the Dragon has its own timer and cannot be replenished, returning to Blood of the Dragon when it expires. Its duration depends on how much of the Dragon Blood gauge was filled.