I was just rereading a section earlier today in WH chapter 17, when Mat enters Tylin's room where Suroth, Anath and Tylin are meeting, and the dice stop rolling in his head:

It was not the presence of Suroth or the strangers that jerked him to a halt, though. The dice had stopped, landing with a thunder that made his skull ring. That had never happened before. He stood there waiting for one of the Forsaken to leap out of the flames in the marble fireplace, or the earth to swallow the Palace beneath him.


Of course we learn that Anath is indeed one of the Forsaken, and later she appears to Suroth as a body of flames.