Zeno Zoldyck is a fictional character from the anime and manga series Hunter x Hunter, created by Yoshihiro Togashi. He is a member of the infamous Zoldyck family, known for their exceptional assassination skills. Zeno is the grandfather of Killua Zoldyck and is recognized for his calm demeanor and strategic mind. As an experienced assassin, Zeno possesses remarkable abilities, including mastery of Nen, a technique that allows users to manipulate their life energy. He is skilled in using Shadows, a technique that enables him to create and control shadows for various purposes, making him a formidable opponent in battles.