Dias is the leader of the Alabaster faction of Lost Millennium. While Dias seems friendly at first, his is actually extremely manipulative and cold hearted, such as tricking a group of Fractale refugees into removing their terminals and forcing them to join his faction, and gunning down one refugee when he attempts to flee. Dias joins Sunda to rescue Phryne and Clain from the Temple, but exploits the opportunity to destroy the facility instead.

Spoiler

During the final confrontation between Lost Millennium and the Temple, Dias's troops sacrifice themselves to destroy the Temple. When Archpriestess Moeran offers Sunda, Clain, and himself safety so that they may witness the restart of Fractale, he uses the opportunity to get close to Moeran, killing both in a suicidal explosion.

(Source: Wikipedia)