The Crimson Moon
"What mark."
As if in answer, a burning sensation bloomed across her chest, sudden and sharp enough to make her gasp, and when she looked down, horrified, she watched a crimson symbol rise to the surface of her skin just above her heart, glowing faintly beneath the fabric of her borrowed shirt like something lit from underneath.
Kael's hands stilled on Ronan's wound. He was staring at the mark with an expression Lyra couldn't name, somewhere between recognition and dread.
"Never let Cassian see that," Ronan whispered, her grip on Lyra's wrist finally loosening, her eyes starting to drift closed. "Promise me. Whatever happens. He can't see it."