Ripplecloak Guardian manifested when moonlight struck sacred river stones during a solstice flood. These stones fused with the spirit of an ancient river guardian, forming sentient armor that sought a worthy otter host. After years patrolling waterfall caverns, it bonded with a warrior otter during a landslide rescue.

The cloak shifts between liquid and solid states, deflecting attacks while creating camouflage ripples. Armor plates are forged from compressed river quartz that hums near moving water. Its disc-blade channels hydrokinetic energy, leaving temporary water trails mid-flight. The knight moves with unnatural silence across aquatic terrain.

Patrols watershed boundaries between realms, preventing pollution incursions and maintaining waterway accessibility. Mediates disputes among river-dwellers using hydrokinetic displays that reveal hidden currents and dangers.