Arcuturus

Arcturus is not only one of the Teeth of Ororegg, but is in fact the  master  of the Teeth of Ororegg. With the ability to command the remaining six Teeth, Arcturus was designed by Ororegg as a fail-safe in the event his janissary Andar sought to draw the blades against him. Unfortunately for Ororegg, after his wyrming his janissary capatins left his service, taking Arcturus and the remaining Teeth with them.

Like all Teeth of Ororegg, Arcturus is a sentient weapon. Its wielder will occasionally see images of the northern skies, their sense of direction heightened in both a literal and spiritual sense.

Mechanics & Inner Workings
Arcturus commands the remaining six Teeth. Anyone who attempts to draw one of the Teeth against the wielder of Arcturus will find their sword leaping from their grasp, refusing to strike its master. Arcturus is named for the northern stars which guide Dragonborn and Andar alike. The sword allows its commander to summon the power of the stars, striking out at foes with bolts of lightning and radiant light.

Significance
Symbol of Liberation, Master Sword