The Lost Spirits (PJO/HOO ATLA Crossover)

Everyone knew Raava, the spirit of light and peace. And Most people also know about Vatu, the spirit of darkness and chaos. But no one remembered the older brother of Raava and the oldest brother. At the start, there were 4 main spirits: Áng, Vatu, Huó, and Raava. Áng was the oldest brother, the spirit of death and despair. Vatu, the spirit of darkness and chaos. Huó, the spirit of life and hope. And Raava, the spirit of light and peace. But it wasn't soon before the lost brothers rose.