The Primevals were practically created to be overseers of all that was created by Order and Choas and although they were products of a combination of the two forces of creation, the ten were still divided among both forces.
Meaning that Five Primevals were agents of Order and the other five were agents of Chaos.
As such, there were two parties; The Party of Order and the Party of Chaos.
While the Primevals are mostly equal in power and had so far not had a definitive victor among each other, there were still main representatives of their parties and they were; Sariel the Primeval Virtue Queen (Main representative of Order), and Nihasa, the Primeval Devil Queen (Main representative of Chaos).