Lets go back, way back, so you understand the history.
A dyeing mother put her twin boys in a basket and sent them down the river. This basket was latter found stuck between two rocks by a fisherman. He took the boys home to his wife, where they decided to raise them.
When the boys were older the older man took both boys on a fishing trip down by the rivers edge. Sitting them down on the lush green floor he told then the dangers of the place they lived. "Wolves viscous and deadly roam this land so be careful or you will be gobbled up."
Luca, the older of the two, was rebellious in nature. Did not heed his fathers warnings and ran off. Lost and cold he curled up on the floor wishing to die. A mother wolf walked by seeing this young boy picked him up and carried him to her den where she cared for him and raised him as hers. He grew up just like them, animal instincts and all, till one day he was bitten by one and became that animal.
Donas, the younger of the two was devastated that he had lost his brother. He was once shy and quiet but after loosing Luca he became distant and bitter. The old fisherman told him not to go into the barn at night because they had bats big enough to carry Donas away. But he did not care and still went into the barn. The bats were startled and came at Donas biting, scratching, and clawing at him. He lied dyeing on the floor when a bat came and bit him right on the neck. It turned Donas into this monster, a blood thirst and savage monster.
It was years later that Luca found Donas. He was on the ground, his cloths blood soaked with a white dainty figure on his lap. Luca came across Donas but couldn't believe this monster was his brother. Donas blamed Luca for what he was and tried to kill Luca. And as the years went by, Donas has tried to kill Luca. Creating monsters just as blood thirst as he was in order to get Luca. While Luca created a family, taking in those who needed a home from Donas aftermath. Giving them the choice to live with him as a normal human or as a werewolf/Lycan. Those that chose to leave had their memory compromised. But some weren't so lucky, if Luca found them on the verge of death and fighting to live, he would turn them. Those few he found as such, had a very low percentage of surviving the change. Not all humans survived the change. But those who were in a healthier state, had a better percentage then most.