Final answer:
The statement is true; Hun-Kame's use of magic costs Casiopea some of her vitality in 'Gods of Jade and Shadow'.
Step-by-step explanation:
The statement is true. In Silvia Moreno-Garcia's novel Gods of Jade and Shadow, the Mayan death god Hun-Kame does indeed drain some of Casiopea's vitality every time he uses his magic. Their connection means that they are in a symbiotic relationship, which is both beneficial and costly to Casiopea. As Hun-Kame grows stronger and regains his powers, Casiopea finds herself physically and emotionally drained, indicating the sacrifice she must endure to help Hun-Kame regain his throne.