Ender

The blood lust had taken him. Ender cursed himself for not coming to a little more quickly after the fight with Marcaius. Truthfully he wasn't sure what force had allowed him to even part with the vampire when Lucian bellowed into the air. Ender was grateful that he had, though. The fact remained that the fight could have gone on for hours, and Caroline was in mortal peril. Ender was an idiot. 

Even without Aniyoh's explanation, he could see his wife was not long for this world, and he had been so lost in his need for revenge that Ender almost entirely missed her falling ill. 

It had all happened so quickly. One moment she was standing so proudly challenging Marcaius, truly a wondrous sight to behold. Ender had wrongly assumed she could handle herself. Caroline's power had become so great over the last few months that he took for granted her frail human nature.