The ulaks knife is a weapon that appears on the Chronicles of Riddick science fiction movie. The ulaks knife had first been forged by the ancient monks, used in defense of honor. Ulaks are curved single-edged knives with serrated edges typically used in tandem.

Characteristics: These "swingblades" are capable of slicing and stabbing positions, and are designed to compliment the natural motions of a person's arms and hands in close combat. The serrated edge is used for blocking other bladed weapons.

History: Richard B. Riddick took a pair of these from a mercenary on-board the Dark Athena. Several years later he acquired another pair from a guard at the Crematoria Slam Facility.