" Look at him! Gregori made his order impossible to ignore. One of the most powerful ancients alive, he forced her compliance without a qualm, holding her mind focused exactly where he wanted it. Jacques and Mikhail had thrown their strength and power squarely behind him.
Shea’s terrified gaze returned to the older man as bidden. He was gray, his body swaying unsteadily. Suddenly he fell to his knees.
“Damn it, old man!” Wallace sounded scared. “Don’t do this to me. What the hell is wrong? Are you having a heart attack?” He didn’t go near his uncle. In fact, he backed up, dragging Shea with him, looking wildly around as if afraid they weren’t alone.
Slovensky was strangling, choking on the blood pouring from his mouth, literally drowning in it. He clutched his throat, trying to pry imaginary fingers from around it. Then his hands went to his heart as his chest began to literally rip open.
Shea cried out but could not look away with Gregori forcing her to obey his command. Then suddenly, as Slovensky’s heart exploded violently out of his chest and he slumped forward, face down onto the floor, she was released. "

― Christine Feehan , Dark Desire (Dark, #2)