Wraven claws had a venom which wasn't toxic but did have harmful effects like paralyzing the skin nerves and making the spot lose its sense of touch.
This would make the infected bleed out until they die because the wound wouldn't heal. Cedric was also injured but his resistance to poison saved him. Due to the effects of the Venom and the large layers of clothes Abrielle was wearing combined with the strong scent of blood he was covered with it was hard for Cedric to sense the injury.
She was strong because considering how long they had been walking most people would have collapsed from blood loss but yet the weak talentless heiress of the Nightshade family was still awake.
"You are injured behind," Cedric informed Abrielle who was stunned because she didn't sense anything amidst. She clicked her tongue and the venom severely affected her nervous system.
