Northern Lights by Philip Pullman / What is the symbolism of daemons

'Northern Lights' by Philip Pullman revolves around Lyra and her daemon Pantalaimon who are journeying North to rescue their friend Roger from an evil organization run by Lyra's estranged mother. Set in an alternate dimension , daemons are a huge factor in this story with their symbolism allowing for a better understanding of the story and characters for both readers and characters.
People and their daemons are connected and cannot survive apart. 'Lyra exulted in it , feeling with him as he flew urging him mentally to provoke the old tillerman's cormorant daemon into a race.' The phrase '…