Yiivaazh is the ruler of the Hellixian, a demonic-like race who over time gained the ability to feed on and amplify negative energy. Around 38,000 BCE (Earth Time), Yiivaazh launched an invasion on the galaxy known as the First Galactic Cataclysm. He only found a challenge in the Huski and Xiin races.
At the end of the brief but devastating war, Yiivaazh would find a true fight in Xatiir, a Xiin male and the One at the time. While the demon king eventually fell before him, he taunted the man, telling him that his race has evolved beyond the bounds of death, and that a physical end would not stop his tyranny. As a result, him and his entire race, both living and dead, were banished to a barren dimension, which they transformed into what could be best identified as the Western version of Hell.
Character and art (c)