“The young archbishop and genius tactician of Velthomer... Bishop Saias is aiding the enemy. As long as he is against us, we have no hope of victory.”
—Dorias talking to Leaf in Thracia 776
Saias (サイアス Saiasu, Cyas in the Japanese version) is a playable character from Fire Emblem: Thracia 776. He is the illegitimate son of Arvis and Aida, as well as the grandson of Cowen. He is a bishop of the Blaggi Church with a high position in the court of Velthomer and one of the greatest tacticians in the history of Jugdral. From his father, he inherited the blood of Fala and the ability to wield Valflame. He is kind and friendly to everyone he meets. As revealed in Chapter 22 of Thracia 776, Aida died protecting Saias from Manfroy, who sees him as a potential threat because of his Fala blood.
Some time after Mareeta falls victim to the Darkness Sword, Saias removes its curse and convinces her to get over fighting against Eyvel, since she was possessed. He also convinces her to accept the Darkness Sword, since she must love all blades to be a true swordmaster, and it becomes Mareeta's Sword, a personal weapon for her. In Chapter 23, Ced gives Saias the Blaggi Sword to pass it to Leif.
He appears two times as an enemy prior to his recruitment and his presence greatly boosts the fighting abilities of his allies, as he is very charismatic. If Ced is recruited during Chapter 23, Saias will leave Leif's army to travel to Blaggi Tower without giving his reasons as to why.
*(5 in Chapter 23, 10 in Chapter 17A and 22)
Saias manages to make Chapter 17A and Chapter 22 absolutely hell for you, but he does join you at the beginning of Chapter 23. Basically, you have to choose between him and Ced, and Saias cannot even compare to Ced when fighting, and the only advantages he has is his leadership stars as well as his useful staves.
Saias - The Bishop of Crimson Flame (赤き炎の司祭 Akaki honoo no shisai)
Saias returned to Velthomer and helped restore the trampled land. His talent was later recognized by Seliph, and he went into the service of the New Kingdom of Grannvale, where he contributed greatly to its reconstruction.
*Enemy only, joins unequipped
“I cannot fight with these wounds... I shall retreat for now.”
—Saias' retreat quote in Thracia 776.