Eclipso

History
Eclipso is a Lord of Chaos who wields the power of the great darkness. When the universe was created, the scales of morality were balanced between Order and Chaos. Each side would gather representatives who would prevent the scales from becoming unbalanced. Eclipso, along with Wotan and Klarion, became Lords of Chaos.

Eclipso eventually becomes an apostle of the God of Death, Nekron, and attempts to bring him into the mortal world.

War of the Universe
Eclipso amasses an army to storm the House of Heroes, where he will attempt to destroy the indestructible White Lantern. Destruction of the Lantern would "potentially" allow Nekron to pass into the mortal world, as well as the extinction of all life in the universe.

Nabu, a Lord of Order, confronts Eclipso in an attempt to stop him. The two are evenly matched, but the scales have been tipped. Imbued with the powers of Nekron, Eclipso is able to gain the upper hand, mortally wounding Nabu. Before being killed, Nabu teleports himself to the Rock of Eternity, where he warns the Quintessence of Eclipso's power, before succumbing to his wounds.

Eclipso is confronted by the forces of Yuga Khan, where they battle for control of the tower. The Wizard leads the charge against both groups, blocking their path. As the war rages on, the conflict begins to destabilize the universe, ravaging all of creation.

The war culminates when Mobius drives his sword into the White Lantern, sending a shockwave across creation. The wave hits Eclipso, overloading his power, as he was infused with Nekron's energies. Eclipso explodes, causing him to shatter; reducing him to a mere purple diamond.

Powers

 * Power of Chaos
 * Immortality
 * Omnipotence
 * Power of Nekron