Beneath Two Trees
In the tale Beneath Two Trees, Nahash was originally a protector of the Tree of Knowledge and kept watch over its secret power. He spoke of all the wonders that came with the Tree’s power, the power that would test man’s skill and spirit. His sister, Hakhama (Mekhane), was the guardian of the Tree of Life, keeping watch over its gifts.
During the Scarlet King's conquest, Nahash saw him coming from the east, rising out of the Abyss to consume creation. Nahash became frightened by this and, out of fear, acted out of line. He wanted to attack first, so he spoke to Hawwah, since she was wiser than her husband, and told her of what would happen. He asked her to use the gifts of the Tree of Knowledge against the Daevites, but she declined.
Nahash then spoke to Qayin, warning him of the king in the east and revealing the secret knowledge to him, teaching him the most powerful magics and spells. However the knowledge became a burden on Qayin, his mind strained from this burden, eventually leading him to striking down his brother, Hevel, with a stone, not killing him, but getting Qayin banished from the valley.
After this, Nahash fled, first to the space-tower at Babel, and later on to the Library, where he remained in penance for his participation in these events.
Nahash's appearance in the Wanderer's Library eventually led to the formation of the Serpent's Hand.
When We Came Home
In the tale When We Came Home, after Mekhane was repaired, Nahash returned from his exile to help his sister and humanity to fight against the Scarlet King. However, his redemption was brief as he was quickly ripped into two by the Scarlet King.
- Serpent on the Heroes wiki.