This holy sword was made by a tribal group who worshiped th god Olath Kal'daka meaning dark wolf.

The tribals gave the sword to Kai'shido becsause they thought he was a messenger from Olath Kal'daka due to his whitehair ad black skin

Abilities
The sword can store sunlight from the day and when night comes the stored sunlight makes it even more powerful. 

The sword is near to indistructable making useful for defending as well as attacking.