As a teenager in Boreas, Tressa Crystal Smith and her coven of friends prayed for and by the light of the broken moon. But when she ran away at age 15, fate led her to join a terraforming crew working to rebuild the moon. She felt a connection between her work with magnetic fluids and past rituals. But the arrival of the unwelcome Apex Games ended her peaceful life. Now, she is a legend determined to join the game as a Catalyst, to make a difference, and to protect her home. She can reinforce doors with ferrofluid, create stinging spikes, and cover fields with high ferrofluid walls. Any advanced technology is indistinguishable from magic. It will be too late.