In "Valtor's Mark," Valtor pays a visit to Cassandra and Chimera and offers to grant the two astonishing powers to cast charms and spells and the chance to make all their dreams come true in return for bathing in the light of the Sun of Solaria. Cassandra, tempted by Valtor's offer of being able to rule over Radius, and for Chimera to become the new princess of the Sun and the Moon, leads Valtor to the Steeple of the Sun. Cassandra opens the doors of the steeple and presents Valtor with the sun. He feels its energy flowing through him. After replenishing his power, he grants his accomplices new powers with the Mark of Valtor and transports out of the steeple in the light of the sun.
In "The Pillar of Light," Luna enters the Steeple of the Sun in a panic as the light of the Sun of Solaria is eclipsed. Finding Radius, she asks him if he is alright, but he is displeased that she did not knock. She expresses her concern for him due to the strange darkness plaguing Solaria, but he assures her that the Second Sun of Solaria will compensate for it. Luna once again voices her concerns, but Radius rejects her. Just then, the sun shines blindingly and begins to flicker, weakening Radius as Luna screams out for help. Later, Luna tells Stella about Radius' condition and that the darkness has affected both the suns of Solaria, and that the king cannot live without them.
In "The Eclipse," the Second Sun of Solaria shines again in the Steeple of the Sun as the eclipse of the Sun of Solaria ends.
In "Saving Paradise Bay," the doors of the steeple are seen as Luna intercedes for the alliance against Tritannus, asking the Second Sun of Solaria to shine for the alliance, and through her, send its light to them. Meanwhile, the light of the second sun strengthens the alliance.