The Chosen Ones

In ch.9 you have to finish the obelisk boss and after it give a great magic ball to popag in order to activate teleporters. Go and teleport to the starting location of the chapter - you have to walk in that cave until you'll find Xirenze near to the starting position of the 6 heros in the chapter's starting cinematics.
Yurgimar is located in the top left corner of the map - just use the teleporters also to come somewhere nearby, kill the skeletons and Jurxys and you'll be able to walk to the Yurgimar's lair.

GL!