[Three Skills Combined Into One!]
[White Death - White Storm - White World]
They were all previous legacy skills of Simo's legacy. Isaac never achieved White World since it was at level 750. For his current legacy, there didn't seem to be a third legacy skill, but for Mythical, there was, maybe to balance the legacies slightly, or there simply wasn't a third legacy skill for a powerful legacy such as this.
Now, all his previous three legacy skills combined into one skill, which became the third secret legacy skill for Gaia's legacy.
[New Skill Achieved -> Eternal Death]
[Eternal Death: As the embodiment of life and death, Player Wraith has nigh infinite knowledge and power, having complete control over death and life, therefore can kill or resurrect whoever he wants to—It's a passive ability and cannot be deactivated]
