Spiresight. Shadowsight remembered with a jolt the cat he’d looked up to as a kit, who, as a spirit, had saved him after Ashfur had left him to die in the ravine.  As  he  stared  in  horror  at  the  dark  warrior,  Ashfur’s  eyes  lost Bramblestar’s  amber  depth  and  grew  pale  until  they  shone  yellow  in  the moonlight. Shadowsight stared, hardly able to believe what he was seeing as he recognized Spiresight’s eyes staring at him from Bramblestar’s face. He saw  desperation  there  as  Ashfur  dropped  into  a  crouch,  his  shoulders hunching in fear until Shadowsight knew he was no longer seeing the dark warrior, but Spiresight trapped beneath Bramblestar’s pelt.
“Listen to him.” Spiresight’s mew was helpless with terror. “He has us all—” His mew broke into a gasp as he struggled to go on. “He’ll force us to—”
His eyes closed and Bramblestar’s body uncurled as Ashfur seemed once more to claim it, driving out Spiresight’s spirit as though chasing prey from its nest.

Darkness Within, Chapter 24