Incorporeal Movement. The Hungering Shadows can move through other creatures and objects as if they where difficult terrain. It takes 5 (1d10) force damage if it ends it's turn inside and object

Affinity to the Dark. While obscured in shadow and darkness, the Gnawing Shadows can use the Hide action as a bonus action

Light Sensitivity. The Hungering Shadows has disadvantage on attack rolls, as well as Wisdom (Perception) checks that rely on sight while in bright light.