Morrot is a renegade Rahkshii who enjoys his private life of hunting down powerful Toas. His weapons and body shows how successful he is. The lives of Rahkshii start quite simple as did his. He was born from a Rahkshii Queen on a molten world. Since Rahi did not serve as good enough training or prey he looked to the stars and fled his nest.
His sword is made from the sword and head of a fallen Toa he took down.
He discarded his old sword in favour of a trophy worthy weapon.
His massive shuriken weapon actually belonged to a Air Toa with skills of levitation.
He took the weapon and harvested the Tao's crystal and fashioned himself a holster for the shuriken.
With some minor programming he uses the Toa's crystal to control the shuriken in flight.
His only still original weapons are his dual pincers that he uses as a tail.