Velis met Mydia at Rabanastre, and the two had annual meetings at the city's Southgate until he left to fight in the war against Archadian Empire. Velis died in the battle of Nalbina Fortress, one of the many whose names were placed on the memorial at the Paramina Rift. His death drove Mydia mad with rage, leading her on the path of becoming the Judge of Wings. Feolthanos lured Mydia to Lemurés, where she believed she could bring her love back to life. She was deceived by Feolthanos, and she only created a Yarhi in Velis's form.
While stranded on Tswarra, Isle of the Lost, Vaan and company come across "Velis" being attacked by Yarhi. He initially does not say much, but befriends Penelo after she heals his injuries. He opens up to her and tells her he is looking for someone. They end up spending a lot of time together, making Vaan envious of the two.
Once Velis reveals to Penelo the truth about himself, Mydia arrives and turns him into his true form, the Yarhi, Odin. The party is forced to fight him, but Penelo is unable to hurt her friend and holds back. Vaan hesitates when he is about to defeat him, so Llyud finishes Velis off.
Later, the Ymir Qul Underground sends Vaan and his four friends to the world of the Yarhi, Lesrekta, Isle of Illusions, where they face Velis again. Upon his defeat, he tells them about Mydia and the truth behind the auracite, and Velis turns himself into the godblade, Anastasia and the party can unlock the Yarhi Odin on the Ring of Pacts.
Velis appears with an ice-elemental card.