Silva and Aris talked to themselves for a while, and Silva got to know her better.
She was over hundreds of years old, but she engaged in battle with a hero once upon a time, and that severely injured her.
So, she went into hiding for many years and only woke up recently.
Silva was shocked when she explained the fight to him because the hero she fought was one of the weakest, according to her.
Yet that hero had easily injured her, and Aris was unable to put up a fight. All she could do was run.
This gave Silva a small gauge of the strength of the heroes. He had to get stronger because he was certain that a clash was inevitable.
After getting to know Aris, he left her to Elsa and the guardians. Aris had taken a liking to Elsa and started treating her like a younger sister.
And, of course, Elsa loved it. Silva had come to understand that Elsa just loved attention.