Shadows Summoners are a rare and powerful class of Grisha. Their power is shown in their ability to manipulate darkness and shadows. In Shadow and Bone, Alina described Baghra's power as inky pool of darkness in her hands, which then she, as well as her son, can shape into tendrils or waves of darkness, and in some cases, darkness can be made into the Cut, a lethal ability that uses shadows or darkness to create a slicing effect on the target.
The Demon in the Wood
As a boy, the Darkling lived in a Grisha camp with his mother. He demonstrates his power to Annika, a young Tidemaker, and her younger sister, Sylvi. Annika is frightened by his power when he makes Sylvi apparently disappear, but she admits it only scares her because she has never seen it before. He then uses his power to ward off three boys who were teasing Annika, blinding them with darkness. The Darkling touches Annika's hand, and she realizes he is living Amplifier.