Like the Original Xehanort, the Dark Chasers are in fact a virus of Darkness energy that attach themselves to the present Chasers ever since they were allowed into the Realm of Light just before the 1st Keyblade War a Thousand Years Ago, 100 years ago at the 2nd Keyblade War they were born as twins to the Chaser's at the time and plotted ever since to pull the Realm of Light into Darkness which they were the main Antagonists of the 2nd Keyblade War, presently they are the Darkness of the Chasers in the form of Unversed which they command as the "Elite of the Heartless".