White

White is the boss of Abyss. To spawn it, kill ALL of the corals in the zone (red, blue, yellow and green). After the last Coral is killed, White will spawn in a random location in the zone. He always drops the completed epic 4.5. make sure that the last coral you kill is not a trigger, or white may not spawn.

Hand the completed epic 4.5 in along with your epic augment 4.0 to the Epic Vendor to create your new epic augment 4.5