Gholos took the form of a cloud of gas. It would change colour to suit the occasion; pink normally, red when scared or shocked and blue when attacking. This blue attack, known as "the blue sting of Gholos", could easily kill a human. Gholos was a gestalt entity, able to divide itself into smaller forms. Spending time away from the gestalt was tiring and complete separation was deadly. It used a highly complex language to communicate. It sometimes took decades for an outsider to learn this language. (AUDIO: Bang-Bang-a-Boom!)