Amba

An aged warrior from the icy lands, since she was a hatchling Amba has been fighting tooth and nail to protect the settlements from beastclans, monsters and invading dragons. One day, while being followed by beastclans' scouts, she came across a huge ancient battlefield. In the middle of it laid a frozen corpse of some disgusting beast impaled by a huge sword. She pulled out the blade, hoping to use it against her pursuers, and immediately a wave of pure evil washed over her, her vision going red and her body convulsing helplessly, as the beast still trapped in the blade awoke and took control of her body.
She thrashed and fought in her own mind, wrestling her body and mind back from the beast's disgusting grasp. When she managed to drop the sword, her attackers were but bloody marks on the snow, and even the landscape warped and twisted from a blast of pure plague energy. She sheathed the blade carefully, swearing to keep it from falling into hands of someone more evil, and to use it only in times of direst need.

For many years after that Amba continued to protect her home, using the cursed blade only when all hope was lost and when all other options were used. And every time the blade was unleashed, gaining back the control was harder and harder, and the beast's spiteful remarks and vicious mockery were getting louder and louder, and her scars and wounds were healing slower and slower, skin and flesh growing back disfigured and wrong. But still she kept going, concerned about safety of her village, until she felt that she was no longer sure thst she'll be able to control herself anymore. Anguished, Amba left the settlements, horrified by being turned from her home's heroic protector into its worst threat, ridiculed and tormented by the beast all the way on her path of shame.

But the beast still hasn't won yet. Amba still had just enough willpower to bend her path away from any civilization, gaining some solace in beast's rageful cries. She became a lonely wanderer, avoiding any contact with people and hacking to pieces those poor souls who still managed to cross her path, with only the beast and occasionally another plague spirit called Tanit keeping her company. Through countless hours of shooting angry remarks back and forth between her and the beast, they managed to almost get used to each other's presence, and Tanit's tales and stories about her own greatness and grace were as good of a conversation as Amba could hope for. Amba was almost content with her life, until...

..Until the trio stumbled across an enormous structure made of bone somewhere on the Rotrock rim, which meant that a settlement was nearby. Dragged along with her companions' thirst for blood, Amba could only hope that the inevitable carnage ends soon. Trudging along the road, they could already see silhouettes of buildings on the horizon, and the smell of smoke and sounds of voices further excited their desire to kill.

Amba didn't even notice it at first, then stopped dead in her tracks, confused. Tanit slowed down also, probably unsure of something for the first time in her life. The beast's influence...was GONE, reduced to a quiet whisper in the back of Amba's mind. It turned out that they ventured into the home of a being called Pocha, a direct extension of the Wyrmwound that somehow developed an independent mind. And Pocha didn't like her friends and family being threatened, so she completely controlled all plague energy in the area, granting safety even to dragons of other flights who didn't have plague dragons' natural immunities.

For now the trio is staying in Badblood's territory, this new predicament being a welcome change in their lifestyle. While Tanit harasses the locals and the beast endures long, difficult conversations with both Pocha and her adoptive family, Amba is trying to remember what there is to life besides bloodshed and suffering. She helps along with the housekeeping and teaches a yound, meek dragon named Reek how to REALLY make his foes suffer(he is terrified but appreciates the effort).