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Sanna's "partner."
He was adopted the nephalem, Alucek-Zanur Nemdoc Beldandial, which granted him his abilities. Riho has the ability to open a fragment of hell to summon his weapon, a kusarigama. Whenever he tries to summon his weapon, he is also at risk of getting sucked into the shattered fragment he opened and needs Sanna to hold him down.