Knight

Knights appear to be the name of a class of Hive. This name has only been spotted in gameplay video, and has not been confirmed as a class or expounded upon by Bungie.

Knights have more elaborate armor-and-cloth adornment than Thralls. They appear to wear helmets with optical qualities and seem to lack the long fingers and sharp claws of their Thrall brethren, enabling them to wield energy- or plasma-based weapons. Knights may also use large, glowing, energy-based or energy-enhanced swords in battle.

As Knights have only been seen in gameplay videos, but not discussed by Bungie, nothing more is known about them.