So let’s go with the backstory: (I give thanks to @Gilahu)
Kidrov was a Rahi creator and assigned by Miserix to monitor Rahi populations in the mid-southern regions of the universe, eventually also being assigned to Nurai.
He specialized in creating all kinds of Rahi mounts - most noticeably all those used by the Brotherhood.
Some time after the Great Cataclysm Kidrov was dispatched to the island of Tevanin to smother a rebellion against the Brotherhood led by a group of Toa. While in the end the operation was successful, he died in the fighting there.