According to Akashism, Elvi are the first race of Zavi created by the trinity of AbElZu and are a combination of Leopard and three drops from Abnazu.
The Elvi discovered and maintain RIPgates.
This is why the Elvi language and culture has so permeated the Worlds of the Abzu Galaxy.
The Helios solar system has hence mostly converted over to Mycenaean/Greek beliefs and names while the rest of the Abzu Galaxy still uses the ancient Elvi language for names and places.
The Elvi tend to be on the arrogant side because they once ruled the galaxy.
Elvi are NOT immortal, but live to be between 550 and 750 years (700 is average).
Image Credits: https://nipuni.deviantart.com/.