Eustoriax

Eustoriax was a shadow demon commander that once ruled the secret underground of Drezen before it was liberated by the party. He was appointed the leader after the snakelike demonic monster called a xacarba was destroyed from the side effects of the Nahydrian Elixir. After the xacarba failed, Eustoriax imbibed the Nahydrian Elixir, given by Aponavicius, and turned into a powerful mythic shadow demon. Eustoriax was then appointed as the guardian of the Sword of Valor and Eustoriax was ultimately destroyed by the party.
The shadow demon was instrumental in recruiting Nurah Dendiwhar into the Ivory Labyrinth.