The Specialist is, as it implies, a special class. It consists of Kult , Seven, Chapka, and Hashtag.
The Specialist class deals low damage but deals debuffs such as Slow, Poision, etc.
Specialists play really well with other teammates but often gets shredded alone. It is highly recommended to run around with an Assasin, if possible, as the debuffs often help the Assasin kill the enemy faster.