Harassed relentlessly throughout her youth for being a lightning-breather, Jabber harbored a deep hatred and thirst for dominance. She became strong and killed those who once mocked her.
Realizing her strength, she became a notable warlord, conquering clan after clan. She eventually challenged the Dragon Lord at the time, Infernus, and bested her. Infernus surrendered to her, but Jabber murdered her anyway just to set an example and make all other dragons fear her.
Jabberwocky's reign as Dragon Lord is the reason dragons are largely hated and feared by every other nation. She warred and plundered against everyone, savagely. It was the bloodiest era of Equus history by far.
Torch eventually led an uprising against her and took the crown. Jabberwocky was banished, and went into hiding. She wound up hibernating deep below Griffonstone. Her dragon sickness was so potent, it infested the soul of every griffon, plunging their lands into greed and apathy.