The Divine Aura is a bonus property that was included with the Collector's Edition of Guild Wars Prophecies. It is linked to the account associated with the account key of the Collector's Edition and therefore cannot be transferred to another account.
The 'aura' displayed is different for every profession of Guild Wars and is not limited to Prophecies only characters. For example; your Dervish character created in Nightfall may display the aura (as long as a Prophecies CE account key was associated with that account).
When the character emotes, the aura is displayed at the hands of that character. While using the /dancenew command to display the bonus dances for Assassins, Ritualists, Dervishes and Paragons associated with the Factions and Nightfall Collector's Edition, the Divine Aura will not be shown. However, if you first use /dance (or any other emote that loops except for /dancenew), and then type /dancenew without moving your character in between on an Assassin or Ritualist, they will perform the special dances and display the Divine Aura. A video of this can be seen here. There is currently no way to display both of them on Dervishes and Paragons.
Gallery of the Divine Aura