To the OP - exact same thing happened to me. From here go back to the End of Time and talk to Leandra and the quest will move along. Just report what you learned about the immaculates and then she will advance things and tell you what to do next.
I was having the same issue and this worked for me! Spoke to
Icara in the End of Time (you got the wrong sister hehe) and my quest is now completed, thanks!
