Oh then I'm not sure what the Entity even is... Is she shown, or just a voice? Refresh my memory, especially since I've not done Taral V or Malestrom (hell, any flashpoints other than Black Talon or Esseles with new F2Pers.... recently finally did Lost Island for the first time and was amazed the group wasn't yelling at me for not spacebarring it) without people screaming "**** PRESS THE *********** SPACEBAR" at me in over a year.
Its in the storyline of the class Sith Warrior, chapter 3, nearly at the end, btw.
And for me, saddly or no, she appears to be Kreia, imo.. But who knows?