The Solar Boomerang initially appears as a small metal hilt topped with a magenta-colored orb. When activated, the other half of the boomerang materializes as magenta-colored energy in the shape of a curved dagger's blade.
In "The Golden Auditorium," Riven is seen training with his boomerang.
#124: Attack of the Centaurs
Riven can be seen whipping out his Solar Boomerang against an army of Centaurs alongside the Paladins and his fellow Specialists to help back up the Winx as they prioritize protecting the panicking fair-goers.
The Solar Boomerang can be used to block magical rays. It can also can be used to knock down opponents like a normal boomerang.