Kingdom of Ash (Throne of Glass, #7)

by Sarah J. Maas

He smiled at the spider. She smiled back. And then he struck. Invisible hands wrapped around her neck and twisted. Right as his magic plunged into her navel, into where the stolen seed of human magic resided, and wrapped around it. He held on, a baby bird in his hands, as the spider died. Studied the magic, every facet of it, before it seemed to sigh in relief and fade into the wind, free at last. Cyrene slumped to the ground, eyes unseeing. Half a thought and Dorian had her incinerated. No one came to inquire after the stench that rose from her ashes. The black stain that lingered beneath them. Valg. Perhaps a ticket for him into Morath, and yet he found himself staring at that dark stain on the half-thawed earth. He let go of Damaris, the blade reluctantly quieting. He’d find his way into Morath. Once he mastered the shifting. The spider and all her kind could burn in hell.

Oh shit Dorian can be just as ruthless as Manon