The Athena's Soldiers are normal male guys that go fight to protect Athena, the Sekai God. Like the other Saints, these soldiers never use any weapon.
They are guys that go to the Sanctuary become a saint, and never got a cloth, so, how only saints can leave the Sanctuary, they become slaves of the place. So, the power inside the Athena's Soldiers are variable, because various powerful guys lost the chance to get a Cloth, so, some soldiers has the power of a Bronze Saint.
They are led by various Saints, but the main leader was Gigas and Piton.
After Athena gets the control of the Sanctuary, all they become servants of her.