You can only learn dragon skills if you have special dragon tokens.
There are three different types: thunder, wind and air dragon tokens.
With them you can learn special passive skills in KP from the appropriate NPC, they are all three together at x2140 z2686.
You need a dragon token and some gold for each learning process. Each skill has 40 levels, the higher the skill lvl the more often you have to learn it.
Thunder Dragon Tokens
also known as Heavenriser, you get as a mentor after completing the daily MQ.
NPC: Fei Jie
Concentration - passively increases magic protection
Protective layer - passively increases body protection
Dragon Roar - passively increases extra damage
Wind Dragon Tokens
can be obtained by exchanging your relic points from the GK at the relic hunter (KP x2174 z2652) or at the relic shrine (if your guild owns a relic).
NPC: Tian Jie
Dexterity - increases passive Dodge Melee
Flexibility - increases passive Dodge Ranged
Cunning - passively increases Critical Hit
Torment - passively increases Critical Damage
Air Dragon Tokens
you get as loot at the event "Talk Course Revenge
NPC: Du Jie
Indestructible - passively increases stature
Meridians - passively increases Qi
Powerhouse - passively increases strength
Spirit - passively increases magic
Accuracy - passively increases Precision
Agility - increased passive Dexterity