According to Covetous Shen, Dirgest won the heart of the moon goddess, Liria with his riches and persistence, making her his wife. Jealous, he tried to keep her off the world, but every night she had to travel the sky, where he could not follow. Zei, a legendary thief, decided to steal her from Dirgest, and eventually did so, sneaking into her palace and spending the night with Liria. He left her a gift before he escaped: a precious ruby she wore on her neck.
Dirgest did not kill Zei outright, but slaughtered everyone Zei held dear, including Liria, taking her soul for himself. Zei eventually defeated the demon, imprisoning him within the aforementioned ruby, and wearing it on his neck, becoming a new god of Xiansai pantheon. However, the ruby was flawed, and through the flaw Dirgest could drain the life out of whoever touched the cursed jewel. After a while, Zei could not bear this burden, and cast off his divinity, becoming mortal again. The jewel was hidden in the ancient labyrinth.
When ages later Shen and the Nephalem came for the jewel, with the intention to seal Dirgest's prison permanently, they found the ruby shattered, as Dirgest escaped, leaving his minion Vekriss behind to guard Liria's spirit. After this, Shen decides to pursue the demon, with the goal of imprisoning him again.