Lyssiah isn't a tiefling by birth nor is she a planewalker. She was the result of magical engineering by a power hungry wizard.

She was taken by the archmagus Caldrin when she was barely twelve years old. Her parents had just perished in a raid of their small settlement. The bandits, funded by Caldrin looted the town and burned it to the ground afterwards. The lone survivor, Lyssiah was taken to Caldrin by the outlaws for he had given them precise orders to keep this little child alive. Unknown to the child, Caldrin had been conducting many such raids across the province, pillaging settlements and carrying off many children. He used these children in heinous experiments designed to create absolutely loyal warriors that combined the powers of demon kind and humans.

Caldrin summoned a small army from the Abyss. Demons of all kinds ranging from raging fiends to higher level monsters. Using powerful binding spells he confined them to his walled fortress . Once contained, he started weaving spells that transferred the demon’s powers to the children. Most of the subjects died and those few that survived were often driven mad with rage and had to be destroyed. Lyssiah was the only one that survived, and for that reason was subjected to even more tests by Caldrin to explain how she survived and managed to keep her sanity.

For six years she endured this insane wizard’s tests and trials. From what little she could understand, one of the major reasons she lived was the type of demon she was crossed with. Caldrin chose a quasit (a spirit of great hatred and sorrow) This spirit and the girl shared a common bond (both had been through so much ) that the expected battle over her body never materialized. They simply coexisted. The quasit found great pain within the girl and fed off of it and the child realized that for all their immense power, the demons were prisoners just like she was.

Lyssiah’s physical form began to change at a incredible rate. She grew much faster than a normal child, Her physical strength and co-ordination was astonishing and she also began to take on demonic traits like growing a tail (which improved her balance) horns and eyes that went from a royal blue to pitch black with glowing red irises. Caldrin, in his arrogance, began to give her advanced training thinking that his new “creation” would be loyal to him alone. For he believed that his spells granted him absolute control over her. Little did he know that, with the aid of the demon within, Lyssiah began to fight his dominion over her . She absorbed all the weapons training he could offer and found out that she was an accomplished archer.

Thinking that he had finally succeeded, Caldrin ordered his band of outlaws to ride out into the province’s interior and capture some more subjects to be “altered”. When the bandits returned they had brought back over a dozen kids. Caldrin was ecstatic. He believed that, at long last, he could ascend to his rightful place as ruler of this country with a horde of hybrid warriors and his mighty magics behind them. He ordered Lyssiah to bring the first child to be brought up to the top of his tower where he would begin the transformation.

Lyssiah went to get the child from the holding pen…and stopped cold. Before her was a normal, healthy boy who scampered away from her…bawling at the top of his lungs for parents that would never hear. Even the spirit within her sensed the boy’s anguish…but she couldn’t risk Caldrin knowing about her new-found freedom. She grabbed the boy and proceeded up to Caldrin’s keep. When she reached the top of the tower, she ushered the boy through and, for a second time, stopped cold. In front of her was a great horned demon, larger than anything she could have imagined. It was mad with rage at being confined within a cage of pure energy. Caldrin was impatient, he roughly pushed past Lyssiah and grabbed the child by the hair and brought a curved dagger from his belt.

And that’s when all hell broke loose

Finally, pushed beyond her breaking point, Lyssiah caught the dagger on the way down and twisted savagely. Caldrin was no match for her demon enhanced strength and the dagger fell to the floor. Releasing twelve years of rage, pain and anger she pummeled the wizard across the room. Caldrin attempted to counter her attack with various spells. Most missed Lyssiah but those that did hit only fueled her rage further. With this monster that he made bearing down on him, Caldrin only had time for one spell. He attempted to use a Dimension Door to escape and was almost through the incantation when Lyssiah’s hands broke his neck. The wizard slumped to the floor dead.

With his demise, the cage surrounding the great demon disappeared. Lyssiah prepared for another fight but was surprised when the demon ignored her and took up Caldrin’s body in one clawed hand. He turned to her and, though no words were exchanged, she felt his gratitude for finally freeing him and his brethren. Then he vanished.

Lyssiah and the child left the tower and returned to the holding pens. The outlaws had either ran away or had been mauled by the newly freed demons but the children were all right. She took what she could from the tower and left with twelve kids in tow. She left them in the care of some priests of Eldath who had a monastery nearby. They asked her to stay as well and she did for some time. They also healed both her physical and mental wounds. After a time she realized that the spirit that had lived within her for so long was gone. When she asked the priests about it they replied that when the demons vanished with the remains of Caldrin so did the quasit. But she was left with it’s undeniable lineage. She left the monastery soon after, to find what place she has in this world but vowing to make it a little better….