User blog comment:Aryeh.wolfblade/The missing legions aka fergotten ones./@comment-3416287-20120119021813/@comment-3514402-20120221172208

The one who saw that vision was actually a "she", a woman named Kallista Eris. And she was a remembrancer assigned to the Thousand Sons. She had a knack (more like a curse) for seeing visions of the future and some of the Legion's captains decided they could use her.

It did not end well.