"Androl had been worrying for weeks now. Ever since Logain had left in the night. Where had he gone? Why had he taken Donalo, Mezar and Welyn---three of the most powerful Dedicated loyal to him---along?"

Androl's p.o.v. in ToM p. 682

 

Later, in "Something Wrong" (p. 818) in T.o.M., Mezar reappears in the BT but he has been turned to the shadow, presumably by the 13/13 trick.

oops. I tried to post this as a response to the post below, but somehow I ended up starting a separate thread.