The Crystal Valley, situated on the world of Monastery, was characterized by the rapid and perilous growth of massive crystal spires from the earth. Domina Tagge selected this valley as the location for a lightsaber battle between Luke Skywalker and Darth Vader, intending to guarantee their demise. Nevertheless, Vader, perhaps employing Force Illusion, replaced himself with Baron Orman Tagge, whom Luke subsequently defeated before fleeing the Valley.