Shilen is the oldest child of Einhasad and Gran Kain. She was originally given charge of Water, representing a predominantly female principle and assuming the shape of a being that in some languages is called "naga" while in other languages the spelling is "snake".
Shilen's father, Gran Kain was the least intelligent of all gods. He went and seduced his daughter, conducting an affair with her and at first successfully avoiding the eyes of his wife, Einhasad, until Shilen became pregnant. When Einhasad found out, she became enraged. Stripping her daughter of her position as water goddess, Einhasad ordered Shilen banished from the abode of the gods. Gran Kain turned his back on the situation, and Shilen was left to deal with her fate alone.
While pregnant, Shilen fled to the East. Deep in the middle of a dark forest, she gave birth - cursing Einhasad and Gran Kain with each excruciating labor pain. The babies born of Shilen's horrible labor bore the despair and anger of her curses and became demons. Among them, the strongest creatures were called 'dragons.'
There were a total of six dragons born with curses against the six gods. Shilen was filled with wrath towards Einhasad who had banished her, and towards Gran Kain who had seduced and then abandoned her, and her siblings who did not help her in her hour of need. Gathering the strength of her children, Shilen created an army to punish the gods.
The strongest dragons were ordered to be at the front of the army of demons to fight against the gods. Hearing this, Aulakiria, the dragon of light, looked at Shilen with sad eyes and spoke: "Mother, you don't know what you are doing. Do you really want the eternal destruction of the gods? Do you really want your father, mother and siblings to fall down on the ground in pools of their own blood?"
Her appeal did not change Shilen's mind and the demons invaded the palace where the gods lived. A fierce battle began, with the six dragons destroying everything in the gods' palace. Even the gods were intimidated by the incredible power of the dragons. The battle seemed destined to continue forever. Yet, if the war did not stop, the world would cease to exist, and all living things would be annihilated. Numerous angels and demons were destroyed or vanished. Every day there was thunder and lightning, as strong forces clashed violently in the sky. The Giants and the other living creatures of earth trembled as they observed the terrible fight in the sky.
The fierce battle continued for several years, and eventually the balance gradually tilted towards one side. In spite of suffering many injuries, Einhasad and Gran Kain had stronger powers and destroyed many demons. The dragons kept fighting, though they were deeply wounded and riddled with scars. Their fatigue became more and more apparent however. After a time, it seemed like the war would come to an end with the extermination of Shilen's army. In the end, the dragons spread their wings and flew to the earth to escape. The surviving demons followed. The gods wanted to kill the retreating army. However, due to their own injuries, all they could do was watch as the dragons and demons departed.
As Shilen's children perished one by one and the war was lost, Shilen could not stand her sadness. She created the Underworld and ruled over it.