Once he found out what he needed, he killed his parents and formed the Red Dragon Clan, whose primary objective was to find Blaze. In later years using the DNA of Caro, whom he had imprisoned, to create human-dragon hybrids, and using the dragon's ability to create portals to transport his clan anywhere they needed to go. The quest required that both brothers took a weapon that was given to them by their father (the Drakeswords) and a gift from their mother (their armor). When Daegon made it to the temple of where the swords were, he took them both.
When Taven was awakened, Daegon used his Red Dragon troops in an attempt to eliminate his brother. Taven chased Daegon down to the Netherrealm, but left without finding him. Shinnok had lied to him, telling him that Daegon have already left the realm.
Eventually Taven and Daegon reached Edenia, where they fought for the right to contest Blaze. Daegon lost the battle, even after all his work to surpass his older brother.
Before the fight, Daegon revealed that he had murdered their parents because he was told by Shinnok that they favored Taven over him. However, in Daegon's Arcade ending, he defeats Blaze by cheating, killing him when Taven was fighting him. His parents were revealed to be alive feigning death as to draw out the true nature of their sons. Taven being the noble one will take Argus' place as Defender of Edenia while Daegon will be punished severely for the suffering he caused.