Ere—the Beast, primal instinct given form. Bella—Life itself, the spark that animated all existence. Maya—Soul and Fate, though she groaned at the theatrical pronouncement. Tessa—Time, the force that gave meaning to change. Helena—Death and Space, ending and medium combined.
Annabelle and Robert represented Shadow and Void—the darkness between stars and the nothingness that gave meaning to something.
And Parker... Parker was the being who ruled all concepts, all omnipotence, all magic that existed, including the missing Light aspect that completed the cosmic circle, all possibilities, all magic that held reality together.
They all followed Zhang Ruoyun's example.
Each of them pricked their fingers, their blood floating upward to join hers above the cauldron.
Their blood joined Zhang Ruoyun's above the cauldron.