Solution to improve DRG is to improve the Jump skills and create an AoE combo with existing skills.

Jump Skills.
-Immunity Frame for Jump and Elusive Jump just for ground-based attack (best example, landslide.) excluding obviusly things like ultimate, things that explode and magic itself.
-Reduce the CD from Jump and Spineshatter Dive.
-Increase Dragonfire Dive potency. Add an AoE DoT area to the end of it that last 12 seconds, 1 hit each 2 seconds.

AoE Combo.
-Reduce the TP requirement of Doom Spike and Ring of Thornes.
-Increase Potency of Doom Spike.
-Give us this combo: Impulse Drive -> Doom Spike (+50% potency) -> Ring of Thornes (+100% potency)

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Besides this, SE already notice how Warriors and Dragoons are underperforming/have issues. For Dragoons the upcoming changes are an increased skill animation for jump skills since they are barely a DPS increase that uses too much of our uptime. But that is not enough.