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Riol is a male hyur with blond hair. He wears an eyepatch over his left eye.
Riol is first met at Camp Bronze Lake in Upper La Noscea, where the Adventurer must summon him by whistling at the meeting place. He supplies information on how the Company used the kobold's aetherytes to access the Navel beneath O'ghomoro to face the Lord of Crags. Using this information, Y'shtola is able to manipulate a nearby aetheryte to allow the Adventurer confront Titan.
He later is seen in Patch 2.3 Defenders of Eorzea, where he is in Limsa Lominsa. As Alphinaud began creating the Crystal Braves, Riol took interest in the idea and decided to sign up. He is seen at the company's inauguration in Revenant's Toll as the uniforms are passed out.
During the events of Patch 2.5 Before the Fall, Riol confides to the Adventurer that Ilberd and Yuyuhase have been telling contradictory stories over the shipment of black market arms that were intercepted at the Burning Wall. Later, while seeking adventurer to aid in the defense of Ishgard, Riol mentions that Wilred mysteriously went missing and is being accused of stealing the black market arms.
Wilred's body is later found by Hoary Boulder, Coultenet, and the Adventurer at Urth's Gift. After breaking the news to Minfilia, Riol is told of the boy's death and reveals he began investigating the Crystal Braves ledger. He found several oddly named sponsors such as "Dodo Consortium", which he determined were ultimately proxies owned by Mirage Trust, Teledji Adeledji's business. With many of the Crystal Braves secretly on the Monetarist payroll, he warns that something bad is likely to happen at the upcoming Sultana's banquet in Ul'dah.
After the traitorous Crystal Braves are driven from the Rising Stones, Riol gathers there with the other loyal members of the company. When Alphinaud arrives and attempts to disband the Crystal Braves, Riol, along with the others, professes his continued loyalty to him.