The Shadow Fortress, the Shakan Tzalmaveth,  is Hotan’s old home.  Jixil’s tzalmaveths have appeared there, threatening the surrounding countryside.  Tzalmaveths are shadows of despair and darkness, creeping through forests and draining travelers of power.   They are easier for Jixil to summon than to recruit live critters, though she has always maintained a connection with the Academy's mages.  Tzalmaveths are something out of nightmares and dark legends, none have been seen since Jixil vanished, although many villains have tried.  Usually they turn on their creator since it takes too strong a force of will to control them.  Jixil made them as a byproduct from the negative energy from Darkland’s creation.  Now they’ve grown beyond her control.