On a desolate snowfield high in the icebound passes of a towering mountain range, the fugitive Guardian Mahleena clings desperately to the rim of a bottomless crevasse. Her fingers are slipping on the frozen ground. She can't hold on any longer. Death is coming for her. Her only hope of survival is to abandon the sacred artefact she has carried half-way across the world - Khalia, one of the thirteen off-world Skulls of Light that once graced...