Biscuit summons a masseuse named Cookie (クッキィちゃん, Kukkyi-chan) who employs various massage techniques and a Nen-transmuted lotion to alleviate fatigue and restore vitality. Cookie can also burn off excess fat and treat conditions such as arthritis, muscle tension, and locked joints. This makes it especially useful for training recovery and addressing age-related issues. Although only one type of massage has been demonstrated so far, Biscuit mentions there are many others, including cartilage massage, head massage, and roll massage.
(Source: Hunter x Hunter Wiki)
